Description:Made of Carbon Steel material with chrome plated.A chuck require a key to provide the necessary torque to tighten and loosen the jaws.Allows you to keep your drill bits firmly in place for difficult jobs.Great for replacing lost or worn out drill chuck keys. Specifications:Color: Silver, BlackMaterial: Carbon SteelSurface Treatment: Chrome PlatedGear Teeth Quantity: 11Pilot- Diameter: 8mm / 0.31 inchGear Diameter: 21.5mm / 0.85 inchTotal Size: 103 x 45mm / 4.06 inch x 1.77 inch(L*W) Package Content:1 x Chuck Key.