Feature 1The wheels are made from white polypropylene which is wear resistant, shock damping and makes less noise 2The bracket housings are made from iron plate with zinc plated on the surface for rust resistance 3Swivel caster allows for movement in multiple directions, allow the caster to swivel 360 degrees under a load 4Universal casters can be used for various purpose such as on desks, chairs, small trolleys, luggage cases, etc 5Each caster has a max. load of 10kg, and the total load capacity is better to be less, for example, 30kg for 4 casters, in order to increase service life Features: The wheels are made from whitepolypropylene which is wear resistant, shock damping andmakes less noise. The bracket housings aremade from iron plate with zinc plated on the surface for rust resistance. Swivel caster allows for movement in multiple directions, allow the caster to swivel 360 degrees under a load. Universal casters can be used for various purpose such as on desks, chairs, small trolleys,luggage cases, etc. Each caster has a max. load of 10kg, and the total load capacity is better to be less, for example, 30kg for 4casters, in order to increase service life. Specifications: Material: Polypropylene, zinc-plated iron Type: Swivel Wheel Diameter: 25mm / 1" Mounting Height: 35mm / 1.37" Wheel Thickness: 13mm / 0.51" Mounting Hole Diameter: 4mm / 0.15" Mounting Hole Pitch: 30 x 24mm / 1.18 x 0.94" Wheel Color: White Max. Load: 10kg each Quantity: 4 Package Includes: 4 x Casters .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }