P2750-EG 4 Wheel Light Duty Trolley Assembly for Unistrut, Use for All 1-5/8"...
Silver Finish: Electro-Galvanized Zinc; ASTM B633, Type III. For use withSC12-2-EG, SC12-4-EG, SC14-2-EG, SC12-10-EG, P1000, P1001, P5000, P5001, P5500, P5501 and All 1-5/8" or Taller Strut Channel.