A custom built grappling hook gun based on the Batman The Animated Series TV show.  It shoots the small hooks pneumatically by means of a hose run down the sleeve and the small tank concealed behind the actor's back.  The black plug in the side of the handle is a plug that covers the hole the hose enters. Produced for a Nightwing fan-film by Golden Ace Filmworks.  All clippard pneumatics, with the exception of the gauge were used.  The hook "body" is brass tube cast into the heads.