16mm Chuck Key - Pilot Diameter : 8mm / 0.31 inch; Gear Diameter : 21.5mm / 0.85 inch; Teeth Number : 11. Suitable for 3-16mm drill chuck. 13mm Drill Chuck Key - Pilot Diameter : 6mm / 0.24 inch; Gear Diameter : 17.5mm / 0.69 inch; Teeth Number : 12. Suitable for 1.5-13mm drill chuck. 6mm/10mm Universal Chuck Key - Pilot Diameter : 6mm / 0.24 inch; Gear Diameter : 12.5mm / 0.49 inch; Teeth Number : 11. Suitable for 1.5-10mm drill chuck. Made of heat-treated steel for durability and hardness, smoothly polishing surface treatment, coated with wear resistant rubber, comfortable to grip. Ideal tool kit for unlocking and tightening of various, popular drill chucks to keep drill bits in place. Perfect replacement for lost or damaged chuck keys. Specifications: Color: Yellow, Black Material: Carbon Steel Surface Treatment: Rubber Coated 6mm/10mm Universal Chuck Key : Gear Teeth Quantity: 11 Pilot Diameter: 6mm / 0.24 inch Gear Diameter: 12.5mm / 0.49 inch Total Size: 58 x 34mm / 2.28 inch x 1.34 inch(L*W) Suitable for: 1.5-10mm drill chuck 13mm Chuck Key: Gear Teeth Quantity: 12 Pilot Diameter: 6mm / 0.24 inch Gear Diameter: 17.5mm / 0.69 inch Total Size: 84 x 41mm / 3.3 inch x 1.61 inch(L*W) Suitable for: 1.5-13mm drill chuck 16mm Chuck Key: Gear Teeth Quantity: 11 Pilot Diameter: 8mm / 0.31 inch Gear Diameter: 21.5mm / 0.85 inch Total Size: 92 x 49mm / 3.62 inch x 1.93 inch(L*W) Suitable for: 3-16mm drill chuck Package Included: 3 x Chuck Keys