Constructed of heavy duty steel and PVC Double ball bearing swivel head with threaded M 12 screw bolt fixing Swivel castor wheels This is a set of four heavy duty swivel & braked bolt fixing castors with threaded M12 screw bolt fixing and PVC wheels. It is great for uses ranging from DIY to industrial applications (shops, schools, home and hospitals). Constructed of heavy duty steel and PVC Double ball bearing swivel head With threaded M 12 screw bolt fixing Wheel Type: plain bearing, heavy duty PVC Includes 2 x Swivel Wheels, 2 x Swivel with Brake Wheels Load Rating: 200 Kg/ 440 Lb (50 Kg / 110 Lb each) Great for uses ranging from DIY to industrial applications (shops, schools, home and hospitals) Color: picture color Material: PVC, metal Caster size: 75mm Thread size: 12*30mm Package Contents: 4 x casters Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.