BGenuine Unistrut P2949-EG 2 Wheel Trolley Assembly for use with P1000, P1001, P5000, P5001, P5500, P5501 and All 1-58" or Taller Strut Channel ReviewbP PP Genuine Unistrut P2949-EG 2 Wheel Trolley Assembly for use with P1000, P1001, P5000, P5001, P5500, P5501 and All 1-58" or Taller Strut Channel PGenuine UNISTRUT BrandP2 Wheel Trolley AssemblyPFor use with: P1000, P1001, P5000, P5001, P5500, P5501 and All 1-58" or Taller Strut ChannelP916" Diameter Hole; Thickness: 14" (6mm)PFinish: Electro-Galvanized; ASTM B633, Type IIIP