This is the Maverick America D-Shackle Rated 600lbs Features: Connect float lines and bungees to floats Connect directly to speargun handle Connect a breakaway shooting line The d-shackle is an essential component to connect float-lines and Bungees to floats or to connect directly to the Speargun handle from the float-line or bungee. The other popular use is to connect a breakaway shooting line to the bungee or float-line replacing the swivel.