Drixet Drill Stop Bit Collar Set – Kit Includes: 1/8", 3/16”, 1/4”, 5/16”, 3/8”, 7/16” and 1/2-Inch with Allen Wrench to Tighten The Stops Set-Screws (7-Piece)

Worked as described, easy to use. These make getting a consistent depth when drilling a hole very easy. They are a very good quality.

WOW! Seven stop-collars for under $10? I've spent that much for just ONE collar when I needed it the same day. The words in the item's title ("drill stop bit collar...") are jumbled -- should say "stop-collars for drill bits". I'm pretty sure the most common use for these stop-collars is on bits in electric drills. If you're using a drill press, you have precise control on depth of hole. but in a hand held drill, it's easy to wind up with holes that are too deep, or not deep enough. Slide your bit into one of these gizmos, extend it to the exact depth-of-hole you want, and tighten the set-screw. If I'm drilling a shallow hole, and have to position the collar where there are flutes, I just twist the bit until the set-screw goes into the gullet between flutes...it's more secure -- don't worry about nicking the flutes a bit, they aren't really used to cut, they just pull debris out of the hole. Don't tighten the set-screw too much, you shouldn't be putting any real pressure on the collar, just stop drilling as the collar gets to the surface of the wood or plastic or metal being drilled. And these stop-collars are useful for more than just drill bits -- they work on any tool with a round handle. I use these collars when I'm dressing a grinding wheel, or changing its "geometry". If you have a wheel that's out of round, and you have a dressing tool with a round handle, you can position one of these collars to hold the dressing tool back so that it just barely touches the spinning wheel, slide the tool back and forth on the tool rest until it no longer is removing material, then adjust the collar to allow a bit more extension (maybe a 64th of an inch or so?), and repeat until the wheel is round. This chore is really difficult (for me at least) without a stop-collar. These may not be German engineered super-high-precision items. What can you expect for $8? But of the four I've used so far, three of them fit the bits quite well - i.e., the bits slid into the collars without a lot of slop, so the tolerances are pretty good. On the 7/16" collar, I had to remove a small spur with a rat-tail file, but then it fit well. Altogether, this was a great buy. I'm getting another set for our off-grid property.

These work better than the clamp types, just wish they were marked with sizes.

Worked really well. I purchased some old early 80's Bose 901 Series V speakers. I lusted after these when I was a kid and could never afford them. Got some in really good condition 'furniture wise', but the 18 5" speakers suffered from foam-rot. After a rather tedious set of hours, I was able to re-foam all of them and they really sounded good... What I didn't like was that Bose used simple wood screws to attach the cabinets to the iconic Bose retro-stands. Wood screws into particle board will chew up the cabinets if replaced multiple times. I used the drill stops to limit the depth during installation of some EZ-Lok threaded inserts. Worked great! I installed all 8 inserts with nary a goof. I used masking tape to protect the walnut veneer over particle board and used Gorilla glue to help keep the inserts in place 'forever'. Replaced the wood screws with stainless hex head 8-32 screws and now I don't have to worry about ever messing up the threads if I have to tear-down the speakers multiple times from their stands. Caution: Drill bits are extremely hard tempered metal. Don't be afraid to crank down the set-screw in the collar. AND test that you have to stop tightened enough by drilling first on scrap. I would have punctured the nice cabinetry if I hadn't tried it out first on some junk wood.

These do the job their supposed to. I do not put anymore pressure than I have to because hey it's just a set screw. If I don't have a size that I need then I go back to blue tape.

Used for first time today. Only paid $7.99, so didn't know what to expect. First off, remove package contents over something light colored, so you don't lose tiny set screws. I noticed one was loose before I opened package, luckily. You need something to transfer collars to, comes in plastic bag which doesn't seal. Couple of collars needs inside filed down, when tapped for set screws, there was a burrs that wouldn't allow you to place collar over bit. Filed 2 and checked rest, we're fine, so didn't take long. Had to retap couple of threads, burrs made them tight but still worked. All in all, took longer to find an empty container than to go file and retap. Then they worked great! Well worth the price paid, am happy with purchase. Face it, kind of relaxing messing with them when you think about spending less than $8.

They work for someone who would use them once in a blue moon, but for someone who would use them often it would be better to get something a little better quality in my opinion. One of the set screws came cross threaded but I was able to back it out and thread it in properly. The fit the bit sizes just fine though.

I have l only used the collars for one application, mounting cross country ski binding on skis. Depth of the drilled hole is important, holes in bottom of ski is NOT good. I drilled 10 holes, using the collar (fit to a 5/32" drill bit) to drill approx. 5/8" into the top of the ski. The collar worked well at stopping the bit at the desired depth, but the material being drilled is soft and minimal pressure is required. The collar (stop) stayed in position for the 10 holes, no need to adjust or re-tighten the collar. I was pleased with the results for this application. I cannot comment on applications for many holes or drilling through hard material where much pressure is required on the drill. I would recommend for similar applications. Thank you. Very reasonable price.