Screwdriver bit 5/16" PH 3 For hand operation and use in electric and air tools For extra heavy use Acc. to DIN ISO 2351-2, tip as per DIN ISO 8764-1 PH Hexagon drive as per DIN 3126 - C 8 (5/16“) GEDORE special vanadium steel, gun-metal finish Size 4: the length is not standardised