Standard grade for turning, drilling, milling, reaming, countersinking of hardened steels, white and grey cast iron ligh对硬钢、白铸铁、灰铸铁、轻金属、塑料、合成材料、铝-硅-锰-铜合金、玻璃、陶器、石墨等进行车削、钻孔、铣削、铰孔、穿孔等加工的标准牌号。