Countersunk head with 2 holes. Plus all screws driver bits, sockets to fit security screws, Bolts,Screws. ... Tapping AB, Self tapping B, Pozi head seld tapping B, Washer faced screw AB. Washer pan head with earthing nibs self tapping, Phillips drive bugle head screw. 10.9 all thread, 10.9 studding, FormG washers,Form F washers.