ProX XT-GRU-ARMBLK 24" Truss Tube with Dual Clamp for ProX XT-GRU Rapid Grid Truss Modular System (Black Finish)ProX XT GRU ARM 24" Truss Tube with Dual Clamp for ProX XT GRU Rapid Grid Modular System Black Finish 3mm 19. 5 pole (24" Total) with Pro Clamp instantly gives you a sturdy mounting surface for any clampable professional Truss Rigger to Mobile DJ for an array of lighting or other types fixtures. Made from high grade aluminum the XT GRU ARM is lightweight yet sturdy enough to handle almost any mountable device. It fits any standard 2 trussing and is an