GearWrench 9304 4 Piece SAE Ratcheting Wrench Set 4 pc. SAE Combination set includes - 3/8", 7/16", 1/2" & 9/16" Surface Drive provides a stronger grip on fasteners, reducing fastener rounding Sleek head design enables access to tight spots where a ratchet will not fit Ratcheting box-end needs as little as 5 degrees to move fastener VS 30 degrees for standard box end wrenches Gear teeth are made of all metal construction for strength and durability.