STANDARD AMERICAN SIZE 5/16"-18×1": Threaded caster wheels Diamater: 5/16", Stem Length 1", thread dual locking heavy duty caster wheels with brakes easy to install with included mounting hardware, 4 nuts, 4 washers, and 2 spanner, please confirm the required screw specifications before purchasing the stem caster wheels. SMOOTHER MOVE & LOWER NOISE: The wheels for cart are made of unmarked high shock absorption polyurethane, can reduce vibration, smoothly moved with no marking, won't harm your wooden floor, no noise, the surface of the 2 inch caster wheels is soft and better protects the ground including wood, hardwood, laminate, vinyl, tile and carpet floors. STURDY CONSTRUCTION CASTERS SET OF 4 HEAVY DUTY: Housing made of heavy duty steel for high load, adopted industrial-grade electrophoresis plated steel, precious ball bearings, is extremely hard wearing and resistant to dirt. Each 2 inch caster supports 200 lbs. of load (with a 800 lb. total capacity for four wheels). The swivel casters make the work labor-saving and much more easier to finish. DOUBLE SAFETY BRAKE: Our top plate swivel caster wheels can locks the wheel and the swivel simultaneously, holding the equipment firmly remain in place when the threaded casters are locked. Locking casters design make it more safe when used as rolling workbench casters, industrial casters, heavy-duty casters, especially on uneven surface. WIDELY APPLICATIONS & EASY INSTALLATION: Adding mobility to your furniture, the 4 inch casters can be used indoor and outdoor, both industrial and residential applications, you can easily install these wheels for cart, DIY caster wheels for furniture, make living-room table with wheels, add furniture casters for easy moving. Stem Caster Wheels 2 inch Heavy Duty Threaded Stem Mount Casters Set of 4 with American Size UNC 5/16"-18 x 1" Swivel Industrial Castors with Safety Dual Locking Wheel for Furniture and Cart