[500kg Load Capacity] This set of 4 casters is made of sturdy steel with double bearings and can easily hold 500 kg. [Wear Resistant and Silent] This swivel caster is made of high quality polyurethane with silent tread, smooth surface and wear resistant, it will remain as good as new after years of use. [Dual Brakes] The thrust ball bearings support 360° swivel, and the master locking brake locks the wheel and axle at the same time. Specification: Product Name: Caster Wheel Color: As Shown Material: Polyurethane Size: Wheel Diameter：75mm / 2.95 inches Total Height：105mm / 4.13 inches Wheel Surface Width：32mm / 1.26 inches Base Plate：93 x 63mm / 3.66 x 2.48 inches Mounting Hole Pitch：75 x 45mm / 2.95 x 1.77 inches Package includes： 4 × Caster Wheels 2× Caster Wheels