Hvac service wrench set are made of high quality metal, strong, durable and corrosion resistant. 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.Hex Bit Adapter: 2 inch long, size: 3/16inch and 5/16inch.Compact and Simple Design: This service wrench set is compact in size, with clearly marked sockets for four nut sizes. Flat anti-skidding refrigeration wrench, allowing maximum leverage, suitable for daily work and household maintenance.colour: silverMaterial: metalPackage Contents:2 x Hex Bit Adapter2 x WrenchOnly the above package content, other products are not included.Note: Light shooting 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.