Profile: Magnum Tire Corporation specializes in selling and servicing commercial truck tires. Double coin™ RLB400 is a closed shoulder on highway steel radial driver position which features a extra deep tread depth (24mm) with stone drilling protectors and is designed to reduce uneven wear with closed shoulder. Centramatic™ 800-810 super single balancer is made to fit vehicles with big brake drums of 16 inches and/or brake drums with sprues.