Gedore in 19 14 screwdriver bit socket 12 in hex 14 mm acc to din 7422square drive as per din 3120 c 12 5 iso 1174 with ball retaining groove hand operated knurled grip chrome plated with pressed in pin in gedore vanadium special steel manganese phosphated in 19 17 for oil filter and drain plug screws not standardised width across flat mm 14 mm drive connector square female 12drive connector square female nominal size 12 5 mm length 60 mm tip length t 20 mm diameter 1 2