Solid carbide high performance milling cutters It makes economic roughing of contours in the 2.5D and 3D range with low cutting depth and high feed possible. The new Protostar FLASH for machining of a large variety of different materials: Alloyed steel to 55 HRc Stainless Steel (with reduced cutting depth, max. apf 60%) Hardened Steel to 65 HRc Non ferrious materials (Al, Cu, ...)