keithbyrd
Member
I want to start playing a bit with kitless pens. So a basic question:
I have two triple start taps both M13x0.80 6H HS. One is marked with a GD-4 and the other GD 5- What is the significance of the GD 4 or GD 5?
I have two triple start taps both M13x0.80 6H HS. One is marked with a GD-4 and the other GD 5- What is the significance of the GD 4 or GD 5?