Uniweld 70074 Offset Ratchet Wrench with DHVA Dual Hex Adapter is a double ended reversible ratchet wrench with offset design for knuckle clearance in tight work areas. It is made with chrome plated, heat treated alloy steel construction with stronger gear teeth and reversing mechanism. Has square openings 1/4" and 3/16" at one end; 3/8" and 5/16" at the other. Comes with Uniped's DHW316 Dual Hex Wrench Adaptor which is also made with heat treated alloy steel and plated to prevent rust. It is for use on 3/16" and 5/16" hex liquid and suction valves on residential and commercial equipment.