The one in the middle is a bit (end mill) that is pushed into the cap of the container that it came in, it's plastic but not sure what bit size really is, some kind of end mill, I've got lots of different end mills that I used when I worked in the machine shops. Guessing it's like 3/32" dia end mill with maybe a radius on the corners, hard to tell from the picture.
CarverJerry
ver. 1.188 Win 7- 64b with 6 GB ram @ 2.8Ghz and dual 1Tb hard drives. Rock Chuck & Ringneck vacuum system hooked up to a Harbor Freight large vacuum. Center line text, conforming vectors.