1. There is a certain surface hardness to ensure that the drill bit has a good chip removal ability to reduce the drilling front; but it will not be too hard to wear the drill bit.
2. The material is composite material, with high surface hardness, uniform and smooth surface, suitable for GBA and high precision drilling.

Suitable for samll hole drilling for PCB

PCB White Melamine Backup Board for Drilling
Suitable for use in High -class and precision PCB drilling