R&M, Manual Push Trolley, RPT500, 1/2 Ton Capacity, Adjustable From 7.40"-12.20" Flange Width Designed for long traversing applications suspending both manual and electric top hook hoists. Crown-tread wheels compatible with W and S beams. Wheel ball bearings are sealed and maintenance-free. Easily adjustable for a wide range of flange widths. Safety drop lugs and rubber bumpers are standard. Single flanged machined steel wheels add to the smooth motion. Spark resistant trolleys available. 21.00 L. 12.00 W. 15.00 H.