Magnetic Screwdriver Extension Quick Release 1/4" Hex Holder Drill Bit 60-150mm Features: Material: S2 Steel Color: Yellow / Silver Length: 60mm / 100mm / 150mm Hex shank: 6.35mm( 1/4" ) The interface has a locking mechanism and a built-in strong magnet. The batch header is auto-matically popped up 1/4" hex shank screwdriver bit holder is suitable for most drill, screwdriver, power tool and hand held tool Greatly improved work efficiency with simple operate and fast fastening to make your life easy High quality S2 Steel make it more durable and extend it’s life service time