This set of Martinez Tools is designed for Ti Heads, with a Ti-Hex head bolt and a Ti-Nylon lock washer. This combination of high-strength titanium and durable lock washer ensures a secure fit, while the superior tensile strength of titanium ensures sturdiness and reliability.

4300_Ti is the titanium version of the bolt for Ti M4 hammer heads.  

These heads will come with standard stainless steel hardware, but this part allows for that option to upgrade the hardware.

How to change the head on Martinez hammers