Sealey 42 piece bit set sealey ak219 a set of chrome vanadium 6150 steel bits hardened to b 52 53 hrc b and tempered for added strength includes 3 8 in and 1 2 in sq drive to 10mm hex chrome vanadium steel bit adaptors supplied in carry case with inclined tray for quick and easy bit selection sealey ak219 trx star spline hex bit set 42pc 3 8in and 1 2in sq drive