About This Excellent Quality - Hakkin drill chuck keys are made of solid carbon steel for durability and hardness, smoothly polishing surface treatment, coated with wear resistant rubber, comfortable to grip Exquisite Workmanship - Hakkin Chuck key surface polishing smooth without burr, comfortable grip, rotation and tightening more effortless. Beautiful and practical key wrench, is the perfect clamping adjustment hardware tools 5 Different Sizes - Chuck diameter: 3/4" (20mm) / 5/8" (16mm) / 1/2" (13mm) / 3/8" (10mm) / 1/4" (6mm). Package content : 5 x drill chuck key wrench Functional and Practical - Hakkin Thumb handle chuck key can be used in hammer or drilling mode. The replacement drill press chuck key is a kind of electric drill clamping tool, perfect to tighten or loosen a chuck, which allows a quick change of your drill bit heads. 6 specifications to meet a variety of drill chuck fastening and loosening needs, can be compatible with most of power tool brands.note: Do not hit the chuck key handle with a hammer or other impact tools Functional and Practical - Hakkin Thumb handle chuck key can be used in hammer or drilling mode. The replacement drill press chuck key is a kind of electric drill clamping tool, perfect to tighten or loosen a chuck, which allows a quick change of your drill bit heads. 6 specifications to meet a variety of drill chuck fastening and loosening needs, can be compatible with most of power tool brands.note: Do not hit the chuck key handle with a hammer or other impact tools Overview Brand : Hakkin Material : Carbon Steel Item Diameter : 13 Millimeters Compatible Devices : Drilling Machine Capacity : 20 Millimeters