Features Drill Chuck: The keyless drill chuck can convert 1/2in square connector to match with various bits with 1/4in hex connector. 3 Jaw Design: Comes with a wide clamping range of 2-13mm, the keyless drill chuck with 3 jaw design ensures firm connection. Easy Operation: Suits for varied connecting needs, the drill chuck adapter can be widely used for woodworking, drilling, etc. Good Material: Combining premium plastic and iron materials, not easy to deform and has excellent durability for long work. Easy to Install: Light in weight and compact in size as well, the easy installation can be quickly completed in minutes. Specification: Item Type: Keyless Drill Chuck Material: Plastic, iron. Clamping Range: Approx. 2 ~ 13mm / 0.08 ~ 0.51in Function: 3 jaw chuck used for electric wrench conversion.  Package List:1 x Keyless Drill Chuck 3 x Left Hand Thread Screw Package List 1 x Keyless Drill Chuck 3 x Left Hand Thread Screw