Made for the bigger brick style packs, like MaxAmps, Trinity Eliminator ect.. 
Comes with hardware for mounting. Will fit all Hitman and Assassin chassis, may require drilling a 1/8" hole in chassis on some models. Battery shown in picture is a MaxAmps 6500 drag pack. 
What you get is the Carbonfiber clamp plate, 2- m3x35mm standoffs, m3x8mm screws, m3 lock nuts.