V-Wheel - Sealed Steel VWS1 V-Guide Size 1 - Outer Diameter 20mmSteel V Wheel, 20mm diameter (Size 1) and permanently sealed and lubricated. V Guide wheels are precision ground, dual row angular contact roller bearings with hardened outer surfaces, offering low friction guidance for linear motion applications. They can be used with internal or external 90 degree rails, as well as round shafts. Size 1 = 20mm diameter Permanently sealed and lubricated Matches VR1, VRD1, VRS1 and VRSD1 V Guide linear rails Precision