6" x 2" Silver V-Groove Wheel, 1/2" Precision Bearing, 1200 lbs. Capacity6" x 2" Silver V Groove Wheel, 1 2" Precision Bearing, 1200 lbs. Capacity V Groove wheels are best when used on a V track that is designed to guide gates, racks, shelves, or tables in an intended direction. They are manufacturered from industrial grade cast iron steel. V Groove wheels provide the highest of weight ratings for the heaviest loads. They can hold extreme heavy loads for long durations and are perfect for commercial, industrial, nursery,