... -magnesium alloys, glass fiber, carbon fiber,wood, harden plastic and iron-based alloys, etc.It is recommended for making PCB micro drills ... common steel. It is recommended for the drilling of cast iron,aluminium alloy.TYK30K20-K30≥14.45≥4000≥91.8A good ... -K40≥14.15≥4000≥92.0 Suitable for machining nickel based alloys, titanium alloys, stainless steel,mould steel,chilled hardened steel ...