RATCHET WRENCH ATTACHMENT: Pair with the Hilmor Straight Service Ratcheting Wrench when accessing hard to reach liquid and suction-based valves DURABLE CONSTRUCTION: Engineered to last with high grade steel alloy, heat-treated for maximum strength PRODUCT DIMENSIONS: Length: 0.4", Width: 0.4", Height: 2.1", Weight: 0.1 lbs PROFESSIONAL QUALITY: Hilmor AC Service Wrench Hex Key Adaptor made in the USA FITMENT: Compatible with 3/16” and 5/16” hex valves HVAC Valve Opener