Square Drill Bit Set. Wood HSS Chisel Drill Bits. Mortise Chisel Tools (4 Pcs) - 1/2", 3/8", 5/16", 1/4" Square drill bits for Woodworking

These drill bits work surprisingly well. Paired with an impact wrench, you should get good results.

I mostly work with soft wood like pine so these are ok for my uses. I am not using these a lot so they may last a bit longer than for most people.They are cheaply made though and will not stand up to heavy use. But for occasional use or hobby these are a good starter set.I may mess around with these to see if I can sharpen them up better later on myself.I have a mortising machine and wanted these as extras anyway so they make great spares.

These bits work okay for softer woods - I wouldn't trust them with hard woods.Their construction feels on the cheap side. The boxes are not quite square with a couple bits, and the actual drills don't hold a sharp edge too well. They are fine for occasional work, but if you need something that'll last a long while and keep an edge, you will need to look elsewhere.

I, like others, ordered these without reading the description fully. I do not (yet) have a mortising attachment for my drill press, so I have not been able to fully test these. This review will be based on quality of construction, probable functionality, and features.To begin, the packaging is pretty typical of economy bits. The plastic casing will last if they are not abused, but someone with good Router skills or a nice CNC machine could make a nice cut-out case for them.The bits (I did test that portion) are very sharp and are able to drill through stock easily. They fit into the square head smoothly, and lock into place for easy bit extraction.The channel in the side of the square cutter is designed to easily evacuate the wood shavings/cuttings. The large circular part of the cutout looks like it would provide a route for larger chunks of wood that are not able to find their way out of the slot.Once I get my mortising attachment for the drill press, I will update this review if they do not function satisfactorily. There is nothing that leads me to believe I will need to make that update, bases on what I have seen.

These are pretty cool tools and we're very sharp right out of the box. I have to take the depth gauge off my drill press for these to fit but that's only a small inconvenience considering I how infrequently I need to mortise wood. These did leave a bit of tear out on soft woods like pine but that's basically unavoidable for such a soft wood. Looking forward to using these with harder woods like maple or cherry.

To provide some prospective for my negative review of these mortising chisels I have included a photo of my garage (aka shop) and a photo of a stickley style bed and short dresser/night stand I made out of African Padauk and Mahogany. I have been a hobby woodworker for almost 40 years. I don't do anything for money. I just build furniture for family and friends.The mortising machine that I use is a Powermatic Model 701 a photo of which is included. I have made many hundreds of mortises with this machine and the Delta mortiser that I had before it. The bed that is shown in the photo has over a hundred mortises (large and small) in it on its own.When I received this set of chisels I inspected them carefully and they looked okay. I then compared the 1/2" chisel to my current Delta 1/2" chisel. Two differences were noted. First, the diameter of the base of these two chisels are different. The diameter of the Delta chisel is 5/8". The diameter of the Tianfu chisel is 3/4". This was not a problem for me because the Powermatic comes with both bushings. If you are going to try these chisels make sure that your mortiser will accept a 3/4" diameter chisel. Second, the length of the circular drill bit is longer on the Tianfu chisel compared with the Delta. The Powermatic has space in the drill head to accommodate this extra length.I scrounged a piece of Cherry and installed my current Delta 1/2" chisel and proceeded to cut a 1 1/2" wide mortise 1" deep. There is a photo with chips all over the place showing this mortise. Remember this was cut with the Delta Chisel.I removed the Delta chisel and the 5/8" bushing and installed the 3/4" inch bushing and the 1/2" Tianfu chisel. The first issue that I ran into was that the chisel would get clogged with wood chips. I tried a number of different settings between the circular drill and the chisel and found a setting where chips were adequately expelled from the chisel. I proceeded to try to make the mortise. It took about twice the effort to drive the chisel into the same piece of cherry. When I tried to extract the chisel from the wood it would not come out. It was stuck and stuck hard. No matter how tight I tried to lock down the chisel it would not come out of the wood. After trying for about 20 minutes I soaked everything in WD40 and let it sit for 10 minutes and was finally able to extract the chisel from the wood. I have never had this happen before and I have no idea what design of the chisel makes it bind up like this but as far as I am concerned they are unusable.

This set is decent. They work good but only for like soft wood.

I should have read the description more carefully. I thought I could use these with my drill press but find I need another adapter. One can be had on Amazon for about $20 and I will eventually get one but haven't yet. That said, the bits appear to be very well machined, and I have no doubt they will work as advertised. I will update my review when I get a chance to use them.