Stop scratching your laminate & tiled floors. Standard Office Chair Castor Incorporating Soft Tread Tyre 50mm Ref: hfc0001 Standard office chair castor incorporating soft tread castor tyre for use on tiled, wooden and laminate floors Wheel Diameter: 50mm Fitted Height: 61mm Load Rating: 50Kg Fitting: Push in Bayonett fit 11mm x 22mm Standard Chair Castor sold in sets of 5.fits most office chairs.