Security bit set this security bit set is a set that is needed when you are repairing or doing some maintenance on electronic or mechanical equipment this set contains 33 pieces which are tamperproof t8 t10 t15 t20 t25 t27 t30 t35 t40 hex key 564 332 764 18 964 532 tri wing no 1 2 3 4 spanner 4 6 8 10 torq set 6 8 10 hex key 2 25 3 45 6mm security bit set 33 peice 25mm 60mm magnetic bit holder manufactured from chrome vanadium r