All three punches are made from hardened, hexagon steel and are used for driving tuning pins into the pin block.
Black oxide finish.

174- Punch, 3" long, 1/2" diameter - $27.75
174A- Punch, 5" long, 1/2" diameter - $28.95
174B- Punch, 4-3/8" long, 5/8" diameter - $40.95