Hvac service wrench set are made of high quality metal, strong, and . the hex bit adapter is heat-treated black coating 4 Different Sizes of Refrigeration Service Wrench Set: 1/4inch, 3/8inch, 3/16inch, 5/16inch, these sizes are the most commonly used sizes when repairing the air conditonning and refrigeration equipment Designed for repair use, compatible with air condition, refrigeration and other equipments needing repair and fixing; Compatible with opening and closing compressor service valves, rotalock val ves and shutoff val ves Double-sided reversible wrench.The hvac service wrench features reversible design, which is flexible and convenient in daily use Colour:silver+black Material:carbon steel Size:140mm Package Contents: 1x Ratchet Wrench 1x Hexagon Bit Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.