Tungsten carbide inserts
A complete range of shapes and grades:
CNMG, CCMT, TNMG, VNMG, DNMG, CDMT, SNMG, SCMT, WNMG, VNMG, TPGN, KNUX, APKT, etc.
The grade P is for steel, M is for stainless steel, K is for cast iron and non-ferrious materials.