Silverline 282415 Diamond Core Drill Bit 42 x 150 mm

I used this bit to cut a hole through two layers of concrete blocks to fit an extractor fan. The concrete blocks were about thirty years old and as hard as stone. It took a while but it all went well and I have no problem recommending this drill bit. There looks like there's plenty of cutting edge for a few more cuts so good value.I would say you will need a big SDS drill to spin this bit but you already knew that?

I've used this to cut a couple of holes for extractor fans. It takes time and skill to use it, I can't seem to get the hole perfectly perpendicular to the wall, not sure if it's my lack of skill or the fact I need a more powerful drill. You need to be careful to position the core properly when drilling or it does jam, but it certainly works. Our brickwork is quite old so pretty hard, but it got thru it and is much neater than knocking out a brick with a hammer. Good value too, much cheaper than anywhere else I could find...

Had to put in some 100mm extractor fans, which needed holes cut through 12 inch thick brick and cinder block cavity walls. Got this 107 mm diameter by 150mm long core drill, as it was cheaper that getting someone in to do the job.I was lent a 110mm TCT Core Drill Bit, but that was too shallow to get through a course of brick in one go, so it needed a lot of extra chiselling.With this I was able to cut straight through the wall from one side in one go, occasionally stopping to remove debris, from inside the warm house, on a cold day.My SDS drill is not the best quality and struggled a bit with such a large cutter, sometimes causing the safety clutch to slip, but with care it worked ok.I bought this together with the "Silverline 124518 SDS Plus Core Drill Arbour 200mm" and "Silverline 769992 Morse Tapered Guide Drill Bit 8mm x 200mm".The instructions were in the tiniest writing I have ever seen, or could hardly see, part of which read as follows;Important notes* NEVER use hammer or impact action with diamond core drill bits;* this will damage the cutting edges, increase the risk of jamming and possibly bend longer arbours and arbour extensions* Core drill bits should only be used with drills with safety clutches, with the possible exception of small core drills* Core drills, arbours and extensions are heavy, and core drilling creates a large load for the motor of the power tool, even at low rpm. It is important to consider this when selecting a suitable power drill for the diameter and depth of the hole you wish to drill. It may be necessary to use the `stitch' drilling technique first and then finish with the core drill to make the final cut for the holeSo it was not until I finished and then scanned, enlarged and transcribed the instructions I able to read them and then realised I should not have used any hammer action with the SDS drill. However the cutter still seems in pretty good condition.The guide drill was a bit prone to falling out, particularly with the hammer action, so was firmly tapped into place and stayed in long enough for the core drill to get deep enough to guide itself. Otherwise it all worked ok for me and achieved what was needed at an acceptable cost.

What amazing tool & solid, highly recommended it done the job I brought it for safe me money & hassel from hire one, 91cm, 12 block paving blocks cut for my lights took almost all day to do but it now done and the tool has still got plenty of live in it still

As an electrician, this is a very common size I use. In the past I have always bought the expensive core bits, but this time as money was tight I thought I would try the budget range. To be honest, I was thinking I would use this core for the job we are on the either have it re tipped or bin it, as every other bit of Silverline kit has lasted 5 minutes if I was lucky.Any way, we cored 2 holes through breeze block and common building brick, 2 holes through concrete block and sandstone and 1 hole through a single leaf sandstone wall. Amazingly, this core bit still has 5 mm of the tips left and will do at least another 6 or so holes in similar materials.As for the cutting performance, I couldn't honestly tell any difference between this bit and my previous more expensive Faithful Tools bit. It probably helps with the fact that we use a proper core drill  Dewalt D21580K 1705W 1/2-inch Male BSP 2-Speed Dry Diamond Drill 240V  and not the useless SDS arbors they sell for use with these cores.One last thing, as the manufacturer or Amazon don't bother listing it, the thread size on the core bit is 1/2 inch BSP, so will fit the same arbors as other more respected makes of core bit.

If you need to drill a hole up to say 16mm then there are perfectly good conventional masonry bits available in a variety of lengths. If you want to go from 38mm upwards then there are some really good diamond core drilling sets. In this middle ground there is not much to choose from, which as I needed to drill holes through 9 inch brickwork to run cable conduit was a problem for me. This bit did the job. I used it slowly and it drilled cleanly on the outside, but did give some breakout on the inside. The only slight problem was clearing bits of the core which stuck in the bit and took some careful wiggling to remove them.I see another reviewer has not recommended this as up to the job for concrete which is a shame as it is listed for this. The listing does though say this is only suitable for DIY use, and I think that is fair - it is worth the cost if you will only need it once in a while; if you need to drill these size cores everyday then look elsewhere (and be prepared to pay a lot more).One correction on the listing - it says this goes with the silverline pilot drill and arbour; it does not - neither are needed as this is a standalone item. Despite the lack of a guide drill it was not difficult to get a clean start to the holes.

Everything was as described. 100% satisfied

only needed 1 hole and it did the job cheeper than hireing a drill bit the first bit was faulty tooyh was brocken off but exchanged without problem

Buon prodotto per qualità e prezzo usata già 3 volte su cemento armato da 25 cm, I fori sono perfetti a la tazza nn ha subito alcun danno semora ancora nuova.

Perfecto para lo que quería, atravesar un forjado, 4cm de hormigón y la bovedilla, en el hormigón ay que ir con paciencia, luego la bovedilla lo hace sin problemas

Utilisé avec un perfo bosh pro 850w (pas assez puissant donc pauses très régulières) j'ai fais 2 traversées en 65mm de dalle béton de 15cm chacune (+ l'ancien carrelage) en respectivement 3h et 2h avec à chaque fois un grillage métallique (5mm de diamètre). Je n'ai pas voulu utilisé de carotteuse à eau à cause du parquet déjà en place. Bref c'était du dépannage et le matériel a tenu bon. Par contre il est indispensable de percer les bords du cercle avec des forets béton 8/10mm en 2 ou 3 endroits pour évacuer la poussière automatiquement dans le cas d'un percement vertical du haut vers le bas . Je pensais qu'aspirer régulièrement suffirai mais non, sans trou d'évacuation ça n'est pas efficace. Quand je vois le mal que j'ai eu à passer le grillage métallique il me parait impossible de passer un gros fer à béton avec ce matériel.

Utilisation conforme, juste le forêt conique qui ne permet pas de centrer le perçage. Un pre-percage est nécessaire. A part ça, fait son boulot. Faire attention, à respecter la vitesse de perçage. Pas de percussion. J ai percer un mur en brique épaisseur de 300 mm sans problème.

Mehrmals habe ich nach dem Führungsbohrer nachgefragt, aber keine weitere Information bekommen. Auch bei dem Aufnahmeschaft gab es keinen Führungsbohrer. Mit einer solchen Bohrkrone kann man nur genau bohren, wenn der Bohrer nicht ausschlägt. Dazu dient ein Führungsbohrer.