OTC Tools OTC 6150 7 Piece External TORX Socket Set. Made from superior S2 steel to meet or exceed torque specifications. For use with 1/4" or 3/8" square drives on TORX bolts. Covered by OTC's Lifetime Marathon Warranty. For external bolts. Set includes: E6, E7, E8, E10, E12, E14 and E16 sockets.