Features and Benefits:?Includes Astro?s wider rubber coated roller and bracket to upgrade old model 3037 1/2x18? belt sanders or replace worn components?Wider rubber coated roller improves belt life by up to 40%?6-piece assembly includes, roller, bearings, spacer, screw and bracketThe Astro 3037PAR (Pulley Assembly ? Rubber) for the popular 3037 1/2x18? belt sander is an assembly that replaces current rubber rollers and end bracket or upgrades older 3037?s that we made with a thinner steel roller bearing on the end. This improves bear wear and helps to avoid the tool skipping off a surface when the end of the tool is pressed into it. Perfect for spot weld removal and getting the most out of your belts.