I built this couple of tools to try engraving.
Burin handle is in stainless steel, 18mm diameter, 14cm long, knurled for a better grip. 4x M5 socket set screw blade lock.
The head of hammer is brass, 25mm diameter, one face rounded , one semi-round. I decided to try an aluminum rod as handle, I will modify if it necessary. I decided to use brass and not steel because I needed also a light and soft hammer in my garage