Bi-Directional X/Y Skates allow you to move homes, buildings, and other large structures on I-Beams. An adjustable Guide Roller System keeps the roller aligned on the beam. The design of these Skates allows movement in any direction on the X or Y axis. Each skate is capable of being split into two halves and used with capacities equal to their capacities as a complete unit. Also available with fixed-guide roller system.