[High-quality material] Made of high-quality high-carbon steel, durable, corrosion-resistant, and rust-proof. [8 sizes] The drill stop ring has 8 sizes, and different drill stop rings can be freely selected according to the thickness of the drill bit. [With wrench] It is equipped with a hexagon wrench for easy installation and disassembly. [Easy to use] Simply place the drill limiting ring on the drill bit, adjust the position of the limiting ring, and lock it with a wrench. [Wide use] The drill limiting ring is very suitable for precise drilling as a mechanical collar, suitable for production and repeated drilling work, drilling wood or walls. The drill limit hole is made of high-quality high-carbon steel, which is sturdy and durable, has a good effect fixing and can accurately obtain the desired drilling depth; The drill limit hole has 8 sizes, which can be used for a variety of drills, with a wrench and convenient installation. Product information: Material: high carbon steel Color: black Size: Drill limit hole: Inner diameter: 3mm/4mm/5mm/6mm/8mm/10mm/12mm/16mm/ Wrench: 2.2*0.7in/5.5*1.7cm Packing specification: Hexagon wrench + drill limit hole (3mm*1+4mm*1+5mm*1+6mm*1+8mm*1+10mm*1+12mm*1+16mm*1)