Big Horn Split Ring Stop Collar: 7-Piece Set for Improved Precision and Safety Review

Very poor quality product. I couldn't even use it because when I tried to tighten the screw it came loose completely. Don't waste money.

They are made of steel and do not slip or break easily. Each size uses the same hex wrench, which is included. The price is good too. They're not marked, but I don't mind.

This product will gradually move as you use it multiple times. It's not working as well as I thought it would. Starts off well but when the bit went over the expensive side I couldn't afford to use it. But it's ok, at least I tried. vernon

A few bucks more than cheap collars but they really work. They do not slip at all and do not cause vibration when drilling. I wish they came with a little case or box and they would be perfect. But I threw them in a ziplock bag to keep the kit together since I don't use it every day.

These locking rings are a tight fit on the bits and their surface is parallel to the axis of the bit. I mostly use mine on countersink bits. The clamping screw protrudes slightly and should be taken into account when used next to a vertical panel. They are way better than the old ones I've used with set screws that tighten the bit and are always out of parallel.

These cuffs use a split ring configuration. Ideal for the specified drill size. open to accommodate the larger drill, and on the other hand, the smaller drill just slips through. So I also bought a ring type kit that uses an Allen screw against the drill area to attach the ring to the drill bit.

Good workmanship and threads fit and clamp across the full width of the ring regardless of mounting on the shank or flutes of the part. Don't waste your time with a set screw. They don't show the size, but if you cut open the plastic wrapper on three sides, you'll have a lidded holder that you can write on with a marker. The best value for money I've found.

3-4 stars could be picked at this point. Will be lower if thread ever breaks. The first set was missing a screw so I sent it back for a replacement. All parts were included in the spare parts set. I was and still am concerned about how tight the screws need to be to keep them from moving. Some have complained about thread pulls. Mine has never been disassembled and I've only used it a handful of times as I'm a layman and not a professional everyday user. I can understand why some people took…