Caster Classics Non-marking Gray Rubber Wheel Swivel Caster. 2 inch diameter wheel will not scuff or scratch most flooring. Safe for most hardwood, tile, low pile carpet,and other smooth flooring. For light to medium duty loads. Not recommended for loads over 220 lbs. dynamic (rolling weight) per set of 4 casters. Rated to 300 lbs static (stationary) weight per set of 4 casters. 1-7/8 x 2-9/16 Industry standard mounting plate with mounting height of 2-1/2 inches.