Heavy Equipment Part Mini Excavator Track Bottom Roller Fits for YANMAR VIO55 Steel Black 03151627Description: This bottom roller is a durable undercarriage replacement part for your excavator. Our rollers utilize special high strength hardened steel and quality seal groups that provide excellent lubricating oil retention. Sealed bearings stop dirt, mud, and grime from penetrating inner components. Made of durable material which is totally corrosion and dust resistant, each item has been factory tested. It uses high quality, high strength steel.