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法国金刚石钻探所采用的钻头和岩心管系列，是按照欧美各国统一的标准制定的。即采用金刚石岩心钻探制造者协会（DCDMA）的标准，亦是全世界通用的直径系列。该标准系列，可以从图1的图示上明确看出。图中钻头和岩心管之间环状“公差”含义如下：（1）钻孔直径和套管外径或钻头的系列NX，BX，AX，EX。（2）套管内径和钻头外径或扩孔器外径。（3）钻头的外径和内径（岩心直径），即钻头的厚度。
French diamond drilling drill bit and core series used in accordance with the uniform standards of European and American countries to develop. The Diamond Core Drill Manufacturers Association (DCDMA) standard, which is also the universal diameter range worldwide. The standard series, can be clearly seen from the diagram in Figure 1. The ring “tolerance” between drill bit and core tube in the picture has the following meaning: (1) Series NX, BX, AX, EX of hole diameter and casing OD or drill bit. (2) casing diameter and bit outer diameter or reamer diameter. (3) drill diameter and diameter (core diameter), the thickness of the drill.