Kd Tools Kdt85227 STD Quadbox Reversible Ratcheting Wrench Set - 2 Pieces Gear Wrench 2 Quadbox Reversible Ratcheting Wrenches = 8 Wrench Sizes. Set Contains 2 STD wrenches: 5/16 x 3/8 and 7/16 x 1/2 9/16, 5/8 11/16 3/4 Access: Thin profile head for tight/hard to reach areas. Productivity: Proprietary 5 degree ratcheting Mechanism for greater productivity. Strength: Full polish/fully hardened forged beam.