MVPower 2" Inch Swivel Plate Caster Wheels Rubber Trolley Furniture Plate Castor with Brake, Set of 4 (50mm) Good hard wearing castors suitable for a variety of uses 10cm Gap between floor and plate 2 normal swivel supplied and 2 braked swivel Non-marking rubber 2"(50 MM) casters tyres 17 MM wide, plate 50 MM x 50 MM