Aero-Motive Heavy Duty I-Beam Balancer Trolley, P/N: AER-BT54IFeatures: - High-speed design with steel wheels & presealed high-speed bearings - Available for 4" I-beam or 3 1/4" patented railSpecifications: - Capacity: 500 lbs. (227 kg) - Trolley for 4" I-Beam - Steel Wheels(20LBS) H 6" L 12" W 8" Product available at Amazon.com and BrakeProducts.com
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