Compatible with Various Arrows: suitable for carbon, fiberglass, and aluminum arrows. It can grind the nock and nock section to create a flat, flush fit, promoting reliable seating and consistent flight. Effortless and Smooth Polishing: striped knob design minimizes slipping and reduces user effort. The rotation is stable and precise, delivering a smooth, uniform finish on the nock area. Wide Compatibility: works with most arrow shafts and configurations. Adapts to different diameters and shaft styles for versatile use. Precision Bearings: equipped with precision bearings for smooth rotation, improving grinding efficiency and reducing fatigue. Use scenarios: precompetition tuning to ensure each arrow has a flat nock surface and flush seating; or club prep to handle mixed batches of arrows quickly; field practice to refresh nock surfaces on different materials for consistent accuracy.