Stanley 85-783 20 Piece Matte Finish Combination Wrench Set 20-Piece wrench set METRIC and SAE Chrome vanadium steel forging for durability and high torque Max-Drive wrenches for improved torque than standard wrenches 15-degree box end offset for additional knuckle clearance These high-quality tools are made with chrome vanadium steel for strength and durability and have corrosion-resistant chrome plating The box end of the Stanley Combination wrench employs the Max-Drive system, which allows the box end to contact the fastener away from the corner This system allows 15% more torque to be applied to the fastener and helps reduce fastener rounding Stanley wrenches are designed to meet or exceed ANSI specifications Limited Lifetime Warranty