This is a bottlecap lure.
All you need is...
1 Bottlecap (preferrably without any plastic ring under it)
1-4 BBs depending on how much noise/how fast you want it to sink.
1 small Treble hook (8 maybe)
2 split rings
Scratch awl and Pliers
A piece of wood at least 1/4" thick.
OPTIONAL: Red Sharpie to draw the bleeding gills.
Waterproof epoxy resin to water-proof the lure and/or hold BBs securely if you are just using them for weight/balance. Resin can also be brushed on to give it shine or just give it another layer of protection (coating).
(You may notice the "pilots" to the top left of the photo... I am currently building a Model Stuka as well as the lures).