Shepherd grip neck stem soft tread caster – 50mm diameter 5/16 x 1-1/2 stem black this soft tread caster offers high load ratings with quiet mobility. Ideal for use with electronic equipment, medical equipment, audio/visual equipment & furniture. Soft 70-75/a durometer tread is made of high-tech thermoplastic elastomer. Rivet axle provides positive wheel retention. Twin wheel design for easy mobility. Features 75 lb. Capacity. Wheel diameter measures 50 millimeters. Height of caster is 2-1/4 inches. Black finish.