Product Details: Update your semi with reliable air brake performance, with the Euclid 20.38" / 28-Spline / Right Medium Camshaft Kit that ensures you're Ready for the Road Ahead™. This repair kit tightens the internal components of a brake drum, allowing the camshaft to spread the brake shoes apart and create enough friction to slow a vehicle. Designed with precisely-engineered accessories to offer long-term dependability and wear resistance. FleetPride is your First Click in Heavy Duty®.