AccuLock™ MDX™ MIG gun liner for 0.035 to 0.045 inch Wire, 12 ft length for use with MDX MIG guns. Contact tip is aligned and centered with the liner lock when the diffuser is tightened creating a flawless wire-feed path. Reduces burnbacks, bird-nesting and erratic arc. Replace and trim liners accurately every time - no measuring required! Liners are loaded and locked from the front of the gun, then locked and trimmed flush with the power pin cap at the back. Reduces wire-feeding issues associated with improper liner trim lengths.