Usage Tips:Feature: replacement feeding rolls for Welding Wire Feeder System of MIG/MAG welding machine. It is made by Ball Bearing Steel, High and precision and strength, brings long life and smooth feeding. It provides very stable feeding through the pushing system, high efficiency even in lower feeding speed. 2 Different Grooves for different application: V-Groove for Carbon Steel Wire i.e. ER70S-6, Copper Wire i.e. CuSi. U-Groove for Aluminium Wire i.e. ER4043, ER5356. Specification: Color: Silver Material: Ball Bearing Steel 2 Different Sizes for Different Wire Size: 0.8/1.0mm (0.03/0.04"). 1.0/1.2mm (0.04/0.047"). The Feeder Roll Dimension (ODxIDxH) is: 30x22x10mm (1.18x0.87x0.40"). Quantity: 1 x Feeder Roll Note: And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: (Without retail package) Package: 1pcs x roller