ARC manufacture in house these high quality drive shaft tunnels. Tunnels are rolled from 0.050" 4130N tube, 12" (305mm) long to meet ANDRA requirements. Tunnels are rolled overdepth to accomodate any tunnel vertical height requirements, and come complete with 2 x 180 degree tailshaft loops for ease of mounting (tunnels fit inside loops). Kit also includes 4 clevis and 3/16 4130N mounting tabs and fasteners. Alternatively the loops can be secured with 4 x 1" quick pins. Pins are an additional cost over the standard bolt on kit.