A.0.05~0.15mm B.0.15~0.30mm C.0.20~0.25mm D.0.25~0.40mm
A.0.10~0.15mm B.0.15~0.35mm C.0.35~0.45mm D.0.45~0.50mm
A.鉆孔 B.刮削 C.鉸孔 D.擴(kuò)孔