POWERTECDrill Bit Stop Collar Set, 7 Piece Set Adjustable Drill Bit Depth Stopper with Allen Wrench, Bits Stop with Imperial System Size Markings - 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2” (71491)

I tried theses as soon as they arrived and have to say I am extremely satisfied. I have used the standard ones and have had nothing but grief . So far these have eliminated every issue . They lock on securely , stay in place and did not mar the bit. I used my Dewalt XR 20 volt drill too! Highly recommend.

Best set of drill stops I've seen or used. Well machined and engraved with the size. I started with the set from Harbor Freight which were slightly cheaper than this, however they used the single set screw design which tends to rotate and fall off during use. This design squeezes then entire bit with the collar- a far superior design. Also, this design doesn't allow the allen screw to mar and damage the drill bit like the other design does. I can't see how this could be any better.

They’re pretty simple, just a piece of metal with a few holes, but they do the job pretty well. These drill stops went on my bits easily and didn’t damage them at all, though with coated bits you will need to really tighten the stops on to prevent slipping.I found that if I didn’t double check the stop depth regularly and hadn’t really tightened them enough, they would scoot up the bit without me noticing. It can be difficult to tell how tight is too tight, as I don’t want to damage my bits, but so far no issues with that.Overall I’m quite happy with them, a good value for the price.

It doesn't wabble any more that is where set screw on the drill . This ONE clamps the whole drill, no more collar falling off. Works great. Cost a little a more but well worth it.

What’s nice about these as they clamp the drill bit they don’t have a set. Screw that rides in a flute worked very good for me.

I found that the stop color did not hold well and slipped. In addition, once I cranked down to secure the collar to the bit and then removed it from the drill bit, I could not loosen the collar for future use. It stayed mashed down. I found that I could not use this product. It probably was not this manufactures' problem. I think I would have the same problem with any collar manufactured by other companies.

Well built works great.

This design works much better than the set screw design that you have to line up perfectly on the flat part of the cutting edge of the bit. This aligns perfectly with ease and fits very square and snug. I wish I had found these a long time ago. This product is awesome!