Thick Brass Bushing The brass bushing is used for sealing and fixing, accurately separating the grip from the end, ensuring stability and firmness. Diamond Medium Knurling The grips are knurled at a medium depth to increase friction and avoid slipping or scratching your palms during heavy weight training. 2-inch Olympic Barbell The end is 2 inches in diameter, with no cumbersome nut construction and a smooth surface that makes it easier to put in weight plates. Each Sleeve 2 Ball Bearings and 1 Bushing The barbell is secured and supported by multiple washers and ball bearings to reduce noise during movement and ensure quiet and smooth rotation.