Durable : The carbon steel stop ring is made of high-quality carbon steel, which is durable. It allows you to control the exact depth of the hole you are drilling. Versatile : The stop ring is suitable for repeated drilling operations, for twist drills, wood drills, angle drills, etc. It can be used for drilling wood or walls. High-quality materials : Carbon steel locking ring; stainless steel axle center. Wear-resistant and corrosion-resistant, it is a good tool for woodworking and handicrafts. Use : It is mainly used to set the drilling depth limit on the drill and to accurately control the depth of the hole to be drilled. It is not only suitable for standard drills, but also for drills with curved heads. The drill collar fixed screw will not damage the drill bit. Specifications. Name: Drill Accessories Color: Black Material: Carbide Inventory. 3*Retaining Ring (6,8,10mm) 1*Hex Wrench.