This is a miniature version of the popular Disecto Arm Chopper effect.
Performer shows a frame with holes, and a chopper blade, that cuts through beans, or a cigarette placed in the holes.
Then he places his (or a spectator’s) finger in the hole in the middle of the frame, and passes the metal blade right through the finger, obviously with the finger un-harmed.
A very convincing penetration effect, easy to perform, and well made in laminated wood.