BEAM TROLLEY WITH CLAMP - This versatile Trolley Clamp Combo gives you the option to roll like a trolley or lock down like a clamp, its lightweight, moves super quick from beam to beam, has precision ball bearing trolley wheels, anti-drop plate, durable baked enamel finish, stainless I.D. tag and Individual test certificate and serial number. Each trolley has a lock down screw for added safety, this unique trolley also adjusts to most I, W , and S beams with ease.