Welcome to MadModder!
Sorry John, I did look earlier, but thought I'd give myself some time before commenting....I'm not the quickest kid on the block you know...
Looks like the 'bangers' we used to make as kids… two bolts, a nut to join them and a few shavings of match heads. Throw it up into the air and wait for the explosion This however, looks far too refined for that Jerry