... Styrofoam, plastic, PVC, hibiscus board aluminum panels, steel doors, soft wood, acrylic, etc., and copper, aluminum, stainless steel, aluminum alloy and ... rising carbide materials, N5A cobalt high-speed steel engraving cutting tools has a wide range of applications in milling, advertising, architecture ... carbide ones, suit for bulk-buying. bits for cutting wood (cup cut with chip-breaker spiral bits)