Durable quality: the durable depth gauge is made of carbon steel, specially designed not to damage the bit during use 8 different depth stops: included in the package 8 depth limit rings of different sizes (3, 4, 5, 6, 8, 10, 12, 16mm) can be used for different types of drill bitsUsage: woodworking drill bit set to fix drill bit, limit drilling Constant depth, drilling depth Package includes: 8 drill depth stop rings + 1 hex key, storage box for easy organization and transport Versatile uses: drill stop ring is suitable for repeated drilling operations. Suitable for twist drills, woodworking drills, angle drills, etc. it can be used to drill holes in wooden or drilled walls. It is an essential tool for woodworking and household Product DescriptionFeatures: 1. High quality product. 2. Drilling depth stop ring. 3. Drill holes for the stop ring, clamp and positioner. 4. Hardening and aging Contents:/ 8 drill depth stop rings. 1 hex key. Features: Hardware: Carbon Steel. Color: Black. Size: 3/4/5/6/8/10/12/16mm. Note:/ 1. Due to manual measurement, the size shown may vary by 1-3mm. Thank you for understanding. 2. Depending on the brightness and light settings of your monitor, the color of the actual item may be slightly different from the picture. The actual product is the only one that can be considered standard.