1.Strong capacity. 2.Good quantity Description1. Top plate and yoke assembly: AISI 1045 drop forged steel2. Large top plate provides ease of stability and strength3. Corrosion-resistant zinc plated finish4.19mm nut and bolt king pin, 17.2mm diameter axle and lock nut5. Leg thickness: 9.14mm. Swivel bearing with 12.7mm steel ball Heavy Duty Drop Forged Casters(LSHD7000)