High Quality Material: Our screwdriver bit adapters are made of chrome vanadium steel for high hardness, rust resistance, long life and durability. Adjustable: The adjustable depth screwdriver bit holder fixes screws directly in a predetermined position. depth, allowing precise use of drywall screws. Strong Magnetism: The drill holder is magnetically strong for quick connection or disconnection and ensures it stays in place while driving. Compatible With: 1/4 quick hex shank and 1/4 hex socket. Accepts most electric screwdrivers, manual screwdrivers and drills. Wide Range of Uses: Magnetic screwdriver bit holders are suitable for extensive conversion of various drill bits and screwdriver bits. Also used for deck building, wooden window building, plywood bottom fitting, box building. Specification: Material: Chrome vanadium steel p> Size : 60mm Hex Shank: 6.35mm (1/4") Color: Red Special Function:1. Powerful magnetic tip holds the drill bit, easily picks up and holds 1/4" x 1" Phillips head drill screws 2. To use the drill, it must be placed in the drill holder. To remove it, the black sleeve is released. The pin must be removed before removing the drill. Package Includes:4 x Magnetic Drill Chuck4 x PH2 Drill Bits Notes:This 60mm magnetic drill chuck only accepts single-head drills, not double-head drills.