Firstlaw Fitness I-Beam Rolling Mount for Punching Bag & 4 Foot Rail Combo - BLACK Rolling Mount - Made in the USA I-BEAM ROLLING MOUNT - 4 FOOT COMBO IS THE PERFECT SPACE SAVER ROLLING MOUNT ROLLS ALONG I-BEAM RAIL SMOOTHLY AND MAXIMIZES SPACE DUAL LOCKING BRAKES HOLD IT IN PLACE DURING A WORKOUT OR LEAVE THE BRAKES OFF AND ADD SUPERCHARGE YOUR LEGWORK ALL MOUNTING HARDWARE INCLUDED - POWDER COATED FOR A LONG LASTING FINISH DESIGNED - FABRICATED & SHIPS FROM FIRSTLAW FITNESS LOCATED IN PENNSYLVANIA, USA