Key Features Replacement Castor Wheels - KCT 4 Pack 100mm Heavy Duty Swivel Castor Wheels can be used on an array of items, to repair, relife or convert to a moveable item. Ideal for moving large or heavy furniture. Swivelling and Smooth - Each wheel has a swivel mechanism that creates a smooth movement in a 360 degree direction turning radius. This makes them ideal for use on items where additional range of motion is needed like trollies, carts, armchairs or trunks Heavy Duty - The casters are made of durable and heavy duty material that is up to any task. Ball bearings inside the wheel make any movement smooth and silent. 2 wheels have brakes that keep the item securely in place Versatile Wheels - The KCT wheels can be used effectively on an array of items like sackbarrows, flat bed trucks, desks, chairs, carts, trollies, and dollies. Installation is simple and quick and can be removed when needed. Dimensions (LxWxH) - 15 x 65 x 13cm. (4") Screw Plate - 9.5 x 6.5cm. Wheel Thickness