Looks made to mount and unmount whatever goes on it quickly and easily.
It is sturdy construction but much care and extra machining was done to keep the weight down I guess. It is not cast iron as I thought, but aluminum (a magnet won't stick to it anyway). It tips my fish scale to 2.5 pounds and measures 13 x 14 inches.
Why would it need to be so light weight. I first thought maybe less mass = less heat retention, but couldn't they just put fins on as a heat sink if that were a concern? Does it go on something made to go fast?
I wasn't smart enough to ask the lady what the thing was for but I just had a feeling she wouldn't know anyway. Would have been worth a try. Dumb.