The Barnes 4WD Pro Series GM 14 Bolt measures 50 1/2 inches and are made from a combination of 1/4" and 3/16" steel to keep them light but incredibly strong. The main truss is designed from one piece of steel to eliminate long weld seams with two gussets to help strengthen the truss even more. Designed to give you as low of a mounting point as possible for your upper links.