HUSTON LOWELL Onepalace 4 Pcs Durable Brake Casters Alloy Wheels Office Chair Computer Tables Chairs Swivel Pulley Wheel (2 inches) Product Name: Caster Wheel; Material: Plastic and Alloy. Dimensions: 6.3 x 4.1cm(L x W); Diameter of the wheel: 4.5cm Universally fit all office chair bases with mounting holes. Heavy-duty caster wheels designed as direct replacement wheels for office chairs. Specifically designed to prevent damage to floor surfaces and move quietly.