Uniweld 70074 Reversible Offset Ratchet Wrench with DHVA Dual Hex Wrench Adaptor Double ended reversible ratchet wrench with offset design for knuckle clearance in tight work areas Chrome plated, heat treated alloy steel construction with strong gear teeth and easy-flip reversing mechanism Square openings  and 3/16 at one end; 3/8 and 5/16 at the other Comes with Uniwelds DHVA Dual Hex Wrench Adaptor for use on 3/16 and 5/16 hex liquid and suction valves on residential and commercial equipment DHVA Dual Hex Adaptor fits deep inside and fully engages the 3/16 and 5/16 hex liquid and suction valves