High QualityThe drill stop collar made of high quality carbon steel, durable and reusable, will be firmly fixed in the place of placement, and is not easy to slip, does not damage the drill. Assorted Sizes3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm. Comes with 1 drill limit ring (8pcs in total) with 1pcs allen wrench. Easy to UseDrill the depth stop with the set screw tightened, the collar will stay firmly in place. place exactly where you put them so that the depth of the hole can be consistent, more convenient use of the round tenon Drilling Depth CheckUse the 8-piece set drill hole depth adjustable split ring screw stop collar to precisely control the depth of a hole you are drilling; Designed to hold your drill bit securely in place and grip the full diameter of your drill bit without the screw ever touching the arbor. Wide ApplicationsThe drill bit depth stop kit is used as a collar mechanical, which is very suitable for production and repeated drilling work, suitable for wood or wall drilling. Drill Stop Rings 3/4/5/6/8/10/12/ 16mm How To Use 1.Slide the correct size drill stop to the desired depth in the drill bit. 2.Align the locking screw with the floor (body). 3.Tighten the locking screw with the key provided. Drill Stop Rings 3/4/5/6/8/10 /12/16mm Size: 3mm 4mm 5mm 6mm 8mm 10mm 12mm 16mm Material: high carbon steel, aluminum alloy, 304 stainless steel 8pcs drill depth stopper, stopper kit drill depth gauge, depth stop with hex key, mainly used to fix the drill bit, limit the depth of the drill hole, so that the depth of the hole can be consistent, more convenient use of the tenon round. Package Includes: 8 x Drill Stop Rings (3mm 4mm 5mm 6mm 8mm 10mm 12mm 16mm) 1 x Hex Wrench 2 .5mm If the size of the drill bit differs slightly from the product size, please don& 39;t worry, it can be used normally. Drill Stop Rings 3/4/5/ 6/8/10/12/16mm The drill stops have a built-in screw to help adjust the size and amount of pressure used to tighten the drill stop without damaging it. Allen key will help to adjust and install, uninstall bits stopper and can also be used for any other project. The drill stopper kit fits most drill bits and is easily adjusted to the exact depth required.