PRO-GRADE™ 21-PIECE 3/4" DRIVE SAE SOCKET SET WITH CARRY CASE Professional-quality Pro-Grade™ 21-piece 3/4" Drive SAE Socket Set with Carry Case is designed to perform and built to last at a great price! Heat-treated chrome-vanadium steel construction meets or exceeds ANSI specifications. Features exclusive Dyna-Drive™ Torque System on working side, 4-sided ball detents and chamfered and recessed leading edges. Includes convenient carrying case.