Satin Screw Castor with Rubber Tyre. Sold individually, includes screws. For the 25mm castor the diameter of the wheel is 25mm, with the total height from the bottom of the wheel to the top of the plate at 38mm. For the 29mm castor the diameter of the wheel is 29mm, with the total height from the bottom of the wheel to the top of the plate at 43mm. For the 32mm castor the diameter of the wheel is 32mm, with the total height from the bottom of the wheel to the top of the plate at 48mm. For the 38mm castor the diameter of the wheel is 38mm, with the total height from the bottom of the wheel to the top of the plate at 53mm. For the 45mm castor the diameter of the wheel is 45mm, with the total height from the bottom of the wheel to the top of the plate at 65mm.