Stem Casters Heavy Duty Swivel Threaded Stem Caster Wheels with American Size 1/2''-13x1'' Thread Dual Locking Wheel with Brakes Pack of 4 (3 inch, with Brake) HEAVY DUTY Stem Casters American Size 1/2''-131'' Thread Dual Locking Caster Wheel with Brakes. CAPACITY: 2''--300lbs; 3''-600lbs/ 4''-800lb/ 5''-1000lb per caster set, a total of 300lbs-1000lbs weight capacity. 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! G7056