The pin/ring assembly is a small kit containing two pins and two rings. The pins slide through the holes of the tarp stop body, SL1100833, through the tarp stop upright itself, and out the other side of the body. Select this link to see our inventory of Shur-lok tarp stops, Shur-lok tarp stops. Here, the rings clip onto the ends of the pins to hold them securely in place. This ingenious design allows for a secure tarp stop while in use, and makes removal of stops a breeze. Never worry about changing a stop or even removing the complete tarp with this quick assembly/disassembly. Let the efficiency of a Shur-lok impress you every time.