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【Upgraded High Performance】Our trolleys assembly are manufactured by high precision craftsmanship,The four bearing trolley assembly features a welded bearing and pin shaft to offer more stability for secure use. It uses deep groove ball bearings to make sure you can operate it smoothly without making any noise. 【Premium Bearing Max Load 1000 Lbs】Trolley Assembly uses high-quality bearings, the body is constructed of solid steel, SGS load capacity test and Load capacity over 1000 lbs. Can be installed ceiling trolley system or electric lift at will, easy to operate. 【Size and Design Load】Diameter hole - 1/4(6mm), Weight - 0.56lb, Product dimension - 3-1/8(80mm)x1-23/32(43.5mm)x1-5/16(33mm), Design load - 1000lbs(500kg). Our bearing strut trolleys not only be cost-efficient but also made to handle heavy duty use even in the long run. Please Note: It’s recommended that you use the strut channel horizontally.