... =91.8 TRS> 3600 Grain size 0.5, 0.6, 0.8 high quality.. solid carbide milling cutters,solid ... impact1. Micrograin carbide rod: Grain size: 0.5,0.6,0.8um;WC=90%, Co=10%,;HRA > 91.8 ... inspection machine. 5. We accept the specification as your requirement. 6. Work Piece: Carbon steel, alloy steel, cast steel, ... steel. Aluminum alloy steel, Non ferrous alloy, solid carbide twist drill bit for aluminum alloy