Fences topped by barbed wire remain a common installation at power plants, police stations, correctional facilities, and other venues needing high security. For fences that use 2" posts and 1-5/8" rails, look no further than this steel 3 strand barb arm, available here at America's Fence Store. Fitting atop your post, with a circular hole to accommodate your fence rails, this arm has been fabricated with a vertical build. Climbers don't have a topmost horizontal rail onto which to grab. Besides the three strands of concertina wire to be installed later, the arm's extra height makes it even more difficult for intruders and/or inmates to climb over. Three notches built into the arm secure the wires in place, and the arm's galvanized steel build provides superior rust resistance.