W Spotting 鑽孔倒角新工法:先雙角度中心孔，後鑽孔
新工法！不增加刀具數量，減少加工時間，鑽頭壽命又可大幅提昇。
W Spotting 鑽孔倒角新工法:先雙角度中心孔，後鑽孔
新工法！不增加刀具數量，減少加工時間，鑽頭壽命又可大幅提昇。
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