8 sizes: 8 different depth stops, the box contains 8 different depth stop rings (3, 4, 5, 6, 8, 10, 12, 16 mm), which can be used for different types of drills, and a hex wrench. Durable: The carbon steel stop ring is made of high-quality carbon steel, durable and long service life. It will accurately control the depth of the hole you are drilling. Widely used: The drill stop ring is suitable for repeated drilling operations, suitable for twist drills, wood drills, angle drills, etc. It can be used for drilling wood or drilling walls. High-quality material: Carbon steel stop ring; the center of the pin is made of stainless steel. Wear-resistant and corrosion-resistant, it is a good tool for woodworking and woodworking crafts. Method: It is mainly used to fix 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 drill bit. Description: 1. Each set has two positioning pin centers, solid positioning pins and hollow positioning pins, you can choose according to your needs. It is an indispensable tool for carpentry and household use. 2. In pin carpentry, the center point of the pin is generally used to precisely align the hole. With these drill bits, you will quickly and easily drill a hole to a precise depth. 3.The specially designed and durable carbon steel drill depth limiter will not damage the drill bit when used. The box contains 8 depth limit rings of different sizes, which can be used for different types of drill bits. Specification: Material: Carbon Steel Color: Black Total Length: M3: Inner Diameter: 3mm/0.1inch, Thickness 3mm/0.1inch, Height 8mm/0.3inch M4: Inner Diameter: 4mm/0.1inch, Thickness 3mm/0.1inch, Height 8mm/0.3inch M5: Inner Diameter: 5mm/0.2inch, Thickness 3mm/0.1inch, Height 8mm/0.3inch M6: Inner Diameter: 6mm/0.2inch, Thickness 3mm/0.1inch, Height 8mm/0.3inch M8: Inner diameter: 8mm / 0.3inch, thickness 3mm / 0.1inch, height 8mm / 0.3inch M10: Inner diameter: 10mm / 0.4inch, thickness 3mm / 0.1inch, height 8mm / 0.3inch M12: Inner diameter: 12mm / 0.5inch, thickness 3mm / 0.1inch, height 8mm / 0.3inch M16: Inner diameter: 16mm / 0.6inch, thickness 3mm / 0.1inch, height 8mm / 0.3inch Package includes: 1 * M3 1 * M4 1 * M5 1 * M6 1 * M8 1 * M10 1 * M12 1 * M16 1 * Hexagonal Wrench Note: 1.Due to the light and screen setting difference, the item's color may be slightly