Description: 360 degree rotating, , smooth, silent and sturdy. Double ball bearing and locking bring a max loading capacity of 440lbs and safety. Steel structures body is extremely hard wearing and resistant to dirt, bearing heavy duty. Made of non-marking polyurethane, absorbs shock and vibrations. Multiple use for flight/instrument cases, display/exhibition equipment, dollies, tool boxes, light machinery, equipment stands, mobile workstations, speakers, cabinets, stands, amps, electrical enclosures, furniture, chairs, etc. Specification: Material: Polyurethane, Steel Size: Approx. 01: 6 x 4.5 x 6cm/2.36 x 1.77 x 2.36inch 02: 6 x 4.3 x 6cm/2.36 x 1.69 x 2.36inch 03: 10 x 4.3 x 10cm/3.94 x 1.69 x 3.94inch Package Includes: 1 Piece Swivel Caster Wheel(6 Pack) Note: Please allow 5mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.