More compact and 50% lighter than conventional trolleys, this CM Low-Headroom Trolley is every bit as rugged. Made of the highest quality rolled steel. A unique ball bearing wheel design provides as much as 5 times greater wear. Trolley can negotiate radius curves as tight as 7–10", depending on the capacity. CM’s exclusive Dial-Fit™ collars are die-cast aluminum and adapt to a wide range of I-beams and flat or wide flange beams. Made in USA.NOTE: Dimensions given are for the minimum S-Beam and will vary with larger beams.