or ground in the mining, chemical and oil and gas industries, moving up from steel to Tungsten Carbide can improve tool life, dimensional accuracy, cost ... RANGE OF TUNGSTEN CARBIDE GRADES FOR INSERTS* Tungsten Carbide Inserts 4 BUTTON INSERTS – GROUND PARTNO. Ø D (mm) H (mm) GRADE 7,0 10,0 T6 8,0 11,0 T6