Premium 90 Degree Engraving Bit
These are premium engraving bits used in conjunction with the Ghostwriter website to allow you to engrave your lower receiver.
These are TiCN coated to achieve longer life and cleaner engraving.
The bigger the angle of the engraving bit the shallower it will machine into the surface of the lower to achieve the same line width. Generally the smaller the angle the better it can do fine detail, but will leave deeper valleys.