ER16 wrench size: 120 x 20 x 7 x 13 mm/ 4.72 x 0.78 x 0.28 x 0.51 inch ER20 wrench size: 135 x 28.5 x 9 x 17 mm / 5.31 x 1.12 x 0.35 x 0.67 inch ER25 Wrench Size: 140 x 35 x 12 x 20 mm / 5.51 x 1.38 x 0.47 x 0.79 inch Material: Made of alloy, overall heat treatment, high hardness, high torque and long service life. Electrophoresis: The surface is treated by a special process, with high wear resistance, anti-rust and anti-corrosion Item Descriptions: ER16 Wrench Size: 120 x 20 x 7 x 13 mm/ 4.72 x 0.78 x 0.28 x 0.51 inch ER20 wrench size: 135 x 28.5 x 9 x 17 mm / 5.31 x 1.12 x 0.35 x 0.67 inch ER25 wrench size: 140 x 35 x 12 x 20 mm / 5.51 x 1.38 x 0.47 x 0.79 inch Material: Made of alloy, overall heat treatment, high hardness, high torque and long service life. Electrophoresis: The surface is treated by a special process, with high wear resistance, anti-rust and anti-corrosion High bite precision: Three sizes to meet your needs. Package: 1 x ER16 Type M Wrench 1 x ER20 Type M Wrench 1 x ER25 Type M Wrench Item Specifications: Type:Type M Model:ER16, ER20, ER25 Surface treatment: Electrophoresis Color:Red Material:Alloy