RUITOOL Drill Bit Stop Collar Set, 2 Pieces

I've used these depth stops several times with different sized drill bits and they work really well. They are simple to use and with a little bit of a twist to tighten them, they hold their position perfectly. One thing to note is that the internal components are plastic so you need to be careful about not letting the drill bit overheat or it will probably cause the depth stop to slip or even permanently damage the plastic parts. Also the wood shavings can get packed in around the drill bit, which could cause an error in the depth. I just make sure it's clean prior to drilling each hole.

These are great drill stops. They aren't perfect and have limitations on drill sizes accommodated. But for most applications needing an easily setup, adjusted and used tool this is the ticket. My opinion is WOW! These are great. My only wish is that this was a set of 4. A super small stop for very small drill bits (1mm and smaller) and an extra-large for really large bits (3/8" and larger). But overall, when I need a drill stop for most common needs, I use these. All my other depth stops just sit in my tool chest unused. This meets 98% of my drill stop needs.

As you may know, I only do a review of i am very impressed or very disappointed. Sadly, here's i am very disappointed. While using these any amount of pressure and the stop slips, not doing is job at all. So just tighten them you day. No matter how tight i made them, they slip. Add to that, with a bit too much tightening, the plastic inside holding the bit breaks making the whole thing more useless than it was.Verdict: do not buy. Get one that works.

I never liked the ring style that uses a set screw on the to attach to the bit. The best way to use this tool is to separate the two halves, remove the plastic piece and insert it over the smooth end of the bit with the flutes completely exposed then reassemble and loosely thread male and female halves together. Next. set the depth by pushing the bit into the fixture. Once you get the desired depth, tighten the two halves together. It works perfectly.