HEAVY DUTY Stem Casters American Size 1/2''-13×1'' Thread Dual Locking Caster Wheel with Brakes. CAPACITY: 3''-300lbs/ 4''-400lb/ 5''-500lb per caster, a total of 900lbs-1500lbs weight capacity. | Standard American Size Threaded Diamater: 1/2''-13*1'' ; American Size Threaded Length: 1"/25mm; Wheel Diameter: 3"/4"/5". | Features -- HEAVY DUTY; 360 Degree Rotation; Dual Locking with Brakes; No Noise, Safe to Floor; FLEXIBILITY & SAFETY & STURDY; | Easy to use & Accessories Included -- The Stem Casters come with accessories needed, customers can use it conveniently! 100% WARRANTY & CUSTOMER SATISFACTION! | WIDELY APPLICATION -- The Swivel stem casters make the work labor-saving and much more easier to finish! The casters are wide applicate in medical home, transport, industry, supermarket or factories etc all different industies!