... , Styrofoam, plastic, PVC, hibiscus board aluminum panels, steel doors, soft wood, acrylic, etc., and copper, aluminum, stainless steel, aluminum alloy and ... processing tools has a very good value for the money. With the rising carbide materials, N5A cobalt high-speed steel engraving ... solid carbide ones, suit for bulk-buying. bits for cutting wood (cup cut with chip-breaker spiral bits)