sizes: 8 different depth stops, the box contains 8 different depth stop rings (3, 4, 5, 6, 8, 10, 12, 16mm), suitable for different types of drill bits, and a hex wrench. Durable: The carbon steel stop ring is made of high quality carbon steel, which is durable and has a long service life. It will precisely control the depth of the hole you drill. Widely used: the drill stop ring is suitable for repeated drilling operations, suitable for twist drills, woodworking drills, angle drills, etc. It can be used to drill wood or drill walls. High quality material: carbon steel snap ring; the center of the pin is stainless steel. Wear-resistant and corrosion-resistant, it is a good tool for woodworking and wood crafts. Method: It is mainly used to set the limit drilling depth on the drill bit and precisely control the depth of the hole to be drilled. It is not only suitable for standard drill bits, but also for curved head drill bits. The fixed screw collar will not damage the bit. Description: 1. Each set has two locating pin centers, solid locating pins and hollow locating pins, which you can choose according to your needs. It is an indispensable tool for carpentry and household. 2. In spindle joinery, the center point of the spindle is generally used to precisely align the hole. Using these drill bits, you will quickly and easily drill a hole of precise depth. 3. Specially designed and durable carbon steel drill depth limiter will not damage the bit when used. The box contains 8 depth limiting rings of different sizes, which can be used for different types of drill bits. Specification: Material: carbon steel Color: black Overall length: M3: inner diameter: 3mm / 0.1inch, thickness 3mm / 0.1inch, height 8mm / 0.3inch M4: inner diameter: 4mm / 0.1 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0.3 inch M5: inner diameter: 5 mm / 0.2 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0 .3 inch M6: inner diameter: 6 mm / 0.2 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0.3 inch M8: inner diameter: 8 mm / 0.3 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0.3 inch M10: inner diameter: 10 mm / 0.4 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0.3 inch M12: inner diameter: 12 mm / 0.5 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0.3 inch M16: inner diameter: 16 mm / 0.6 inch, thickness 3 mm / 0.1 inch, height 8 mm / 0 .3 inch Package Include: 1*M3 1*M4 1*M5 1*M6 1*M8 1*M10 1*M12 1*M16 1*Hex Wrench Note: 1. Due to the difference in reg Due to the light and screen, the color of the items may be slightly