3Pc Magnetic Bit Holder Set. Holds Standard 6mm/1/4" Screwdriver Bits. Magnetic Sockets To Hold Bits Securely. Quick Bit Changes For Convenience. KW1-KW17, PA20-PA38, PA41-PA49, PA60-PA78, PH4-PH44, PH49-PH50, PO (Isle Of Wight) TR (Isles Of Scilly) ZE (Channel Isles).