These are Seth Nightroad's (<3) "fork blades", from the Trinity Blood manga. I honestly think the anime's are much too fragile to count as weapons.X)
This was for something i was dreaming of making in the beggining of the year. I asked my father if he could help me with them, as i'd already learned how the tools worked in another occasion but did not want to screw it up. I woke up one morning to find them already cut *sigh*. My dad said he was afraid i'd loose a hand or two if i did it by myself XD
So all i did was draw them in paper, then copy them onto the wood. After they were cut i had to make several wooden spikes for the handle (and this time i got to the machine first! XD) and sand the whole thing down, to make the edges look like...well, blades.
The handle was nailed in place because it's much safer this way than having it cut out from the same piece of wood than the rest: it is less likely to break and is more easily grabed.
Last but not least, yes, i know in the pic the spikes look sharper, but for safety, transportation, and endurance reasons i decided to make them that way