... steel Applications and Features :We are professional manufacturer of steel products like mild steel, low carbon steel, round bar steel, free cutting steel bar, 1215 environmentalist steel, Q235 steel and ... H7, H8, H9, can save cutting tools 40%, and increasing 40% productivity. 1. specification: Diameter: 25mm, 40mm, 50mm, 60mm, 75mm, 80mm, 90mm ...