Coffing CBT plain trolley is an economical choice for most applications. The trolley features steel wrap around side plates, dual tread wheels and lifetime lubricated shielded ball bearings. All the CBTs features combine to ensure you a trolley that is smear rolling, versatile and reliable. Coffing® Hoists Manual Trolley, Plain, Series: CBTP, 0.25 ton, Fits Beam Flange Width: 2 to 8.7 in, Fits Beam Height: 4 to 24 in, 27 in Minimum Radius Curve, 2.36 in Wheel Tread Dia, Steel Wheel