This ia a handle for a cheap carbide tipped scriber, making it much nicer to use, and due to it's triangular shape, less likely to roll off your work surface.

This is made to work with a pretty cheap scriber that I got from AliExpress that only came with a protective cap for the tip, but otherwise it was just a metal rod.

This handle gives you a better grib and control over the tool and helps you make accurate markings. The handle is symmetrical, so no difference between right or left handed use.

I simply used 2 drops of cyanoacrylate (CA or super glue), to permanently affix the handle.