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 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 drill bit. 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 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 includes: 1 * M3 1 * M4 1 * M5 1 * M6 1 * M8 1 * M10 1 * M12 1 * M16 1 * Hex KeyWelcome to meet