Designed by PRO Mountings the first ever I Beam roller mount for punching bags! Roll it out and lock into position or leave unlocked and let the bag move with you intensifying your workout and simulating real fighting situations!! The I Beam Roller is excellent for all style fighters..MMA Fighters, Boxers, Muay Thai Fighters and Kick boxers. For Heavy Bags up to 250lbs! Check out the Roller track which allows you to mount your roller system anywhere!! Dont be fooled by cheaper competitive products, if you want the best than choose PRO Mountings the innovator in I-Beam mounting systems.