P-clamps are steel clamps used to secure cables and pipe to strut or tray. There are 2 types we use at our plant, one is U shaped with a saddle on the inside of the U, you would slip the clamp over the cable hook the open end on the tray rung or strut and tighten the saddle down with the screw that is attached to the clamp. The other style is a 3 piece unit. If you have access to the Unistrut Catalogue you should find them there.
