HEAVY DUTY Stem Casters American Size 1/2''-13×1'' Thread Dual Locking Caster Wheel with Brakes. CAPACITY: 2''--300lbs; 3''-900lbs/ 4''-1200lb/ 5''-15000lb per caster set. Standard American Size Threaded Diamater: 1/2''-13*1'' ; American Size Threaded Length: 1"/25mm; Wheel Diameter: 1.5''/2''/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! Stem Casters Heavy Duty Swivel Threaded Stem Caster Wheels with American Size 1/2''-13x1'' Thread Dual Locking Wheel with Brakes Pack of 4