26PCS ER32 Spring Collet Set for CNC Engraving Machine & Milling Lathe Tool Workholding Engraving Collets

Collet set is of good quality and I have used several of them on my CNC. Was a good purchase.

For the price, you won’t find better. If you need absolute precision, you’re shopping in the wrong place and had best adjust your budget.Mine were all machined well and useable out of the box with only a quick cleaning to remove packing oil. Runout was less than .001” (I don’t have a test indicator with more resolution as my work doesn’t require that level of accuracy) and definitely acceptable for my purposes. They hold appropriately sized end-mills very well and I haven’t experienced any slippage even with heavy cuts in tough material.

Fantastic collet set. First day I had them I used at least three different collets. I would give 5 stars but, one of them had a couple of pieces of metal chips inside from the slot cutting. I could not hesitate to buy them again, just know you'll want to check each one before the first use to make sure any metal chips do not interfere with the closer. I used the 3/8 to tram the head on a new mill. I then used the 1/4" to hold a indicator to square up my new vise and to mill the vise keys to fit my slots. I then use the 1/8 to mill a slot in a part. The results were perfection.

Fast delivery quality parts. Would buy again.

Everything was great they look great

Exactamente lo que esperaba. 1ra calidad

I used almost every one of these for a drill regrinding project, (1/8-1/2 by 1/32nds) and they all appeared concentric, gripped well, and gave drills with near perfect split points. (Perfect as far as I can measure.)I did not try to measure the accuracy of the holder, but if you are trying for sub 0.001" accuracy, I suspect that this should probably not be your set of choice.

These are collet-shaped objects. They are not collets.The product page has out-right lies on it. It claims 0.0005" accuracy. I measured the Total Indicator Runout (TIR) of a couple of these "collets" and found some to have as much as 0.0028" of runout. That's almost 3 thousandths of an inch of runout. Let me repeat that. Almost 3 thousandths of an inch of runout. Almost 6 times worse than what's claimed on the product page. Might be ok if you're drilling holes, but if you're milling steel with an end mill this is unacceptable (even for a hobby-machinist).They have random gouges on them (from the "machining" process by which they were manufactured). The vertical slits are filled with burs that span the entire width of the gap (preventing them from compressing like an actual collet would).It appears that someone was practicing or learning how to make collets and decided it was ok (it's not) to sell their mistakes on Amazon. This company should be ashamed of themselves, and this product should be delisted from Amazon.A complete waste of your time. DO NOT BUY.