Heavy Duty YG6 Carbide Size: 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 & 1″ Number of Pieces: 1 pc. Material: Heavy duty carbide YG6 is a tungsten carbide grade commonly used for cutting tools, drill bits, lathe tools, milling cutters, and wear-resistant parts. It belongs to the YG series cemented carbide materials.