Unique Drilling bits use tungsten carbide alloy and 42crmo teeth body, could apply to hardness 30-100 mpa rock. And we have lots of different designs, like C31HD, B47K17.5H B47K19.5H, B47K22H teeth, B43H B85 B85/2 holder, which could solve all of your problems.
Large stock available could arrange shipment within one week.