Features. Bits are made from S2 steel to meet or exceed torque specifications. Sockets are made from heat treated chrome vanadium steel for strength and durability. Item Weight - 3.000 lbs. ( 10) Extra Long Triple Square Spline Bit Sockets:. M4 -1/4 in. Drive ( ATD-243). M5 -1/4 in. Drive ( ATD-244). M6 -1/4 in. Drive ( ATD-245). M8 -3/8 in. Drive ( ATD-246). M9 -3/8 in. Drive ( ATD-247). M10 -3/8 in. Drive ( ATD-248). M12 -3/8 in. Drive ( ATD-249). M14 -3/8 in. Drive Tamperproof ( ATD-252). M16 -1/2 in. Drive Tamperproof ( ATD-253). M18 -1/2 in. Drive Tamperproof ( ATD-254). Extra long 4-1/2 in. shank.