CREF-800… Set of 4 Double Appliance Casters. Load rated at 800 lbs per set. This has been designed for rolling refrigerators, dishwashers and other heavy appliances in the home or office. Designed to roll forward and backward. Two 7/8″ OD x 1-1/2 long white propylenr wheels are mounted in tandem and riveted to a heavy duty zinc-plated steel chassis. Width: 1-3/4″ Length: 1-3/4″ Mounting Height: 1-7/16″ Screw: 5/16-18 x 7/8″ long with hex nut. Caster plate SNIBTKT516 works well with this caster. Sold in sets of 4.