To drill a square or rectangular hole, score the material with a scribing iron or a sharp pencil, then punch one or more drill holes right next to each other depending on the required size and drill them out.
You are best using our step drill, which is specially designed for the combitech® dimensions, and afterwards file off the corners with a rectangular file.
More information: https://products.alfer.com
This is a first time for me anodizing titanium. It’s an easy good looking mod you can do at home. Be safe and careful. If anodizing a knife handle, make sure and fully disassemble.