Hegebeck 11.2mm gear diameter Chuck Key Description 1.Designed to fit most of popular drill chucks ,the small key allows for easy storage and use. 2.Used for controlling tightness of looseness of electric drill clamping tool , can be used in hammer or drilling mode,comfortable to grip,Convenient and Compact 3.Made from solid carbon steel and coated with durable paint for long service life ,with high strength, not easy to break. 4.Great for home improvement needs,do yourselves projects and big construction projects.Great to be used with Hammer Drills when a tight fit is required Specifications Color: Black Material: Carbon Steel Surface Treatment: Blackening Gear Quantity: 11 Pilot Diameter: 3mm / 0.12 inch Gear Diameter: 11.2mm / 0.44 inch Package Content: 1 x Chuck Key Note: 1. A chuck require a key to provide the necessary torque to tighten and loosen the jaws. 2. package contain the key but not includes a chuck. 3. Please check the size and style you need carefully before buying.