Do you need to move or transport equipment from one place to another By installing these new small casters on the equipment,there is no need to bear pressure and save energy. It is very easy to move the furniture or equipment to the desired location. Reminder:Please note that the load-bearing capacity of the 4 castors can only be calculated as the total load of the 3 castors,because when the road is uneven,the forces on the 4 wheels will be uneven. Commodity parameters: Product name:Castors Wheels Quantity:4 Wheel material:PVC rubber Wheel diameter:1.5 Inch/40mm Height:63mm Wheel width:20mm Mounting plate:60*43mm (thickness 2mm) Hole distance:45*30mm Hole diameter:6.5*9mm Bearing capacity:30kg (Single Castor) Error problem:It belongs to the error value within the international standard and does not affect the use. Please understand. Suitable for heavy duty casters of various types of trolley,to transport light furniture and display racks lightly and safely.