3 in. general duty rigid caster. Polyolefin wheels give mobility to heavy loads on smooth hard surfaces and finished concrete floors. These wheels are light weight, non-marking and impervious to water and resist chemicals. Long wearing and low cost. Caster has a 210 lb. load rating per caster. Rigid caster moves forward and backward only. Attaches with a plate and 4 screws. Plate size 2-1/2 in. x 4-7/8 in. Color: Black.