This versatile unit can be easily adjusted to any desired width to fit different beam by use of a simple thread. Robust Cast iron universal tread wheels for use on flat or tapered flange beams. Incorporating Sealed "Lube for Life" ball bearings for a long maintenance free life span . Wheel adjustments will fit most I.S.W and I-beams or patented track. Effective for precise spotting jobs. Equipped with 3m of drop chain. Fully conforms to CE safety standard.