Innovative Components AI1/2T1.5-B-TR6 1/2" tapered tip, 2.25" Rounded T knob Spring Loaded Pop Pin 1.50" welds on barrel included Heavy duty spring action pins , used for height and length adjustments on racking systems, fitness and rehabilitation equipment and many other uses. Automatic indexing pins used with included weld on barrel. Barrel can be painted or powdercaoted to match the framing or foxtures to which it is welded on. AI1/2T1.5-B-TR6