Caster Set, Caster Bearing Type Ball Bearing, Caster Diameter 6 in, 10 in, Caster Height 7 1/4 in, 10 in, Caster Material Rubber, Caster Type Pneumatic, Caster Width 2 in, 3 in, Color Black, Compatible with Grainger Part Number 498X54; 35XR82; 35XR83; 498X56; 499H46; 499H48; 498X57; 499H45; 499H47; 498X55; 499H49, Compatible with Manufacturer Model No. 100; 200; 300; 400, Includes (2) 10 in x 3 in rear wheels; (2) 6 in x 2 in semi-pneumatic locking front casters, Number of Casters 4