Applications :For attaching rod overhead to steel beams, wood or concrete ceilings for the purpose of suspending utilities, cable trays, conduit and pipe. Contractors :Electricians, Plumbers, Mechanical Contractors Recommended Pin Size(s) :55080 780 Trak-it Step Shank Pins (all base materials)55081 1" Trak-it Step Shank Pins (all base materials)