centre drill meaning in Chinese

中心孔钻
中心钻

Centre drills for centre holes with protecting chamfer - type b
带护槽的中心钻. b型
Centre drills for centre holes with radius form - type r
弧型中心钻. r型
Centre drills for centre holes without protecting chamfers - type a
不带护槽的中心钻. a型
Drills and reamers - combined drills and countersinks centre drills
钻头和铰刀.第2部分:复合钻和锪钻中心钻
Centre drills for centre holes
中心孔钻

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