Precision V-Groove Wheels Keep things on track with these smooth-rolling v-groove wheels.#2 V-wheel for use with fixed bushing or adjustable bushings. 1/4 mounting screw. Used to build machine slides with v-track or angle iron rails. Similar to those used in Shopbot CNC routers.ABEC 3 Angular contact ball bearings. Sealed bearings to isolate rolling elements from the environment. Carbon steel, ground and hardened for long life and accuracy . These wheels are the same high precision wheels used in our XR Gantry Kit. An affordable guide system solution for your CNC table.