This is the 5" Batman action figure from Knight Assault Batman with Glider and Extension Claw (not shown) from the "Mission Masters" line of figures. It was also sold as "Glider Strike Batman" as part of "Mission Masters" from "The New Batman Adventures".
The glider is BIG. This is the glider in closed position. Click on the pictures below for a bigger and better view. I like that the glider also looks the Bat symbol and the fact that this glider was actually seen in the animated series and not one of those variants and repaints or non-existent gadgets / thingamajigs.
Here's Glider Strike Batman with wings fully extended. NICE! Really looks like a Bat's wings