STRAIGHT SHANK TWIST DRILLS FOR DEEP HOLE JOBBER Application Drilling deep holes in non alloy steels, alloy steels, grey cast iron,malleable cast iron, Special aluminum or magnesium alloys. 品名:鈷高速鋼直柄麻花深孔鉆(HSSCo5) 用途:可鉆削非合金鋼、合金鋼、灰鑄鐵、可鍛鑄鐵、特殊的鋁合金或錳合金。