The Blue Spot Tools 8 PCE Socket Adaptor and Nut Driver Set is manufactured from chrome vanadium for increased durability. All 3 Socket Adaptors 1/4", 3/8" & 1/2" feature a 1/4" hex shank and a ball bearing for a secure hold of the sockets and the 4 Nut Drivers 6-8-10-13mm feature a 1/4" hex shank and contain heavy duty magnets to securely hold self drilling screws and any hex head application the set comes complete with a 1/4" hex shank magnetic bit holder. Manufactured from chrome vanadium for increased durability Ideal for use with most electric drills and impact drivers 1/4" drive hex shank PACKAGE CONTENTS Socket daptors 1/4" x 65mm-3/8" x 65mm-1/2" x72mm Nut drivers 6mm x 65mm-8mm x 65mm-10mm x 65mm-13mm x 65mm Magnetic bit holder 60mm