Check the listing for details. 4pcs 9mm Drill Stop Collar Depth Stop with Hex Wrench Anodizing Surface Silver. Condition: New. Listed at 20.15 USD. This drill bit stop ensures consistent drilling depth around the drill bits, eliminating the need for tape or marking on the bits. Achieve precise and accurate drilling depths effortlessly.Suitable for use on machinery shaft instruments or woodworking tools, this drill depth stop acts as a reliable bit limit ring. It provides flexibility and convenience for different drilling projectsSimply select the appropriate size drill bit depth stop and slide it onto the desired depth of the drill bit. Align the locking screw with the land (body) of the drill stop and tighten firmly with the hex wrench.This drill bit stop collar is primarily used for fixed limit drilling depth, ensuring accurate drilling every time. The screw-type collar design allows for easy installation without damaging the bit.