The MB538NWF is a main bar curtain roller measuring 35mm in diameter and 37.7mm wide, designed to run smoothly along the main bar track of a curtain-sided trailer. It's stocked by LoadMonkey as a genuine-fit spare, ideal when the original roller has flattened or seized and is dragging on the curtain sheet.
Check the webbing or strap running over it isn't also worn before refitting.
