DSPIAE HC Series Tungsten Steel Hook Broach

Since this is hardened tungsten steel, the tip is hard, but brittle and may snap under pressure and especially leverage, be sure to handle the tool responsibly.

This is used for aggressively pulling material out, preferably from existing channels, though you can carve out a channel with it.
I got the 0.6mm, which is generally way too wide, as you should go for the smaller sizes if you're aiming to make panel lines, such as 0.1 and 0.2mm.

Alternatively, if you want an aggressive V channel, you can carve with the tool sideways to deepen small grooves, which I did on my MG Gyan around the ankle armor. This is not really what it is intended for and it does leave staggered grooves, but with patience and careful use, it can do it, due to the sharp edges.

All in all it feels like a quality scribing tip and is plenty sharp for carving out plastic. Like all scribing tools, you should let it do the work and not use too much pressure.
Be sure to use a handle, which is not included, like DSPIAE's own clamp holding handle, which I can also recommend (has a magnetic cap and is triangular, so it doesn't roll off the table).