The CM Series 632 close radius trolley features a shorter and lighter design than competitive trolleys, with all the strength. It has the ability to handle tight curves and maintain low headroom capabilities. Negotiates radius curves as tight as 7 inches. Made of highest quality rolled steel. Unique double row, ball bearing wheel design for greater wear capacity. Larger V-bars available for wider flange adjustment. Bearings pre packed with lifetime lubricant. Exclusive dial-fit collar quickly adapts trolley to wide range of beams and patented rails. Dust covers shield and protect bearings. 1/4 - 1/2 ton capacity. 2-5/8" - 5-1/16" flange range. 4" - 12" beam height. Hook type mounting. Lifetime warranty. 2-3/4" Tread Diameter. 9 lbs Net weight.