*Extruded Aluminum ‘I’ Beam Construction Provides Lightweight, Yet Higher Weight Capacity.* All Welded Frame For Strength And Long Life. *Equipped With A Patented Double Lock Ratchet. Features A High (40 1/2”) And Low (27 1/2”) Belt Position To Handle Various Appliance Heights. *Furnished With A 14′ Poly Belt. *Wide Frame For Stability And Safety. *High Quality Glass Filled Nylon Continuous Belt Stair Crawlers. *Industries’ Finest Non-Marking Vinyl Facing To Protect Appliances. *Available In 6”, 8” Or 10” Wheels.