Bit Holder, Alloy Tool Steel, Drive Size 1/4 Hex In, Shank Size 1/4 Hex Drive In, Length 1 In, For Use With 1/4 Inch Hex Bits, Retainer Type C Ring Hex Insert Bit HoldersModels with C-ring design add internal clip in the retaining ring notch to hold bit more securely. Can be used with socket wrench or socket adapter.