"That attachment works as per the photo below.
Sometimes detached. But originally the shovel was designed for 180g alminum shaft for the shovel(http://www.mizo.co.jp/mountain/mc15_moole.html).
The width 17cm, depth 20cm, thickness 1.2mm.
Stronger than alminum blade, less stronger than iron one.
I had only used it to normal snow and midium hard snow pack, so far so good, no bending. But I do not think it is good for debris."