The Kiloflex power bar is designed with a 29mm shaft diameter and a 195,000 PSI tensile strength for greater rigidness and to reduced whip. The bar knurling is very aggressive but not sharp, allowing for better grip while doing heavy lifts. The bronze bushing bearing has a smooth spin which makes it ideal for slow power lifting movement, squat, bench and deadlift. The extra thin flange on the sleeve allows you to fit more weight for your PRs. The black chrome finish is the best coating for a barbell it will ensure your bar will last longer and not rust.