The AXIS Crossbar Baby Pin Plug is alternative 5/8″ Baby Pin that hard mounts to the AXIS Dual Bar. This “plug” style 5/8″ Baby Pin slides over the top of the bar, and hard mounts using a 1/4-20″ bolt. The advantage of the “plug” style pin is that it will not rotate, or loosen, if the item connected to it rotates. Generally speaking, standard “thread” style baby pins have the tendancy to loosen if the item connected to it rotates. The AXIS Crossbar Baby Pin Plug is 4″ with 2.68″ being the length of the pin, and is machined from billet 6061 T6 aluminum with black mil-spec anodize.