Screw cutter head 7mm and pin 4mm which you can buy here:

4mm center pin with 7mm stainless steel flat head screws

Centre pin 4mm with 7mm hemispherical head screws

Mill to precisely seat the blade to the full tang knife design. It is used to mill precise holes in the knife blade. The holes are first drilled into the scabbard and the knife with a 5mm drill bit (you can buy it here - D4.0 HSSCo drill bit). Then, using a cutter with a 4mm shank, a precise 7mm hole is drilled for the screw head. The cutter material is high speed steel and also drills all commonly used shank materials, including G10. The depth of the milled part of the shank is secured by a stop. If everything is done correctly, it is a very precise and tight connection between the cutter and the knife. If the milling depth stop is set correctly, it ensures a precise height mating of the cutter and the bolt.