Drill stop: Works with standard drill bits and hex head screws; does not damage drill bits. Drill depth stop: This depth stop can be locked at any point on the drill bit and is widely used with high-carbon steel drill bits. How to use: Use a hex key to attach the ring to the drill bit and set the depth. Drill depth stops, drill bit locator for wood. Wood drill bit rings: These rings are used as clamping collars in machinery and are compatible with twist, point, or any other type of drill bit to prevent over-penetration. They are ideal for jobs requiring precision drilling. Wood drill bit positioner: Adopts precision production to improve stable characteristics and high reliability. Drill bit gauge.