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这种钻头共镶四组合金，每四个合金为一组。前边两个合金底出刃为2～1.5毫米，后边两个合金底出刃均比前两个合金底出刃高0.5～1毫米。当后两个合金磨坏时，前边出刃低的两个合金接续工作。但后边合金工作时，与岩石接触面积小，所以压力要小，一般在1700～2000公斤左右。前边两合金接续工作时，前后二齿都与岩石接触，所以接触面积要加大。压力一般在2000～2500公斤左右。合金规格7×15毫米。在7～8级的灰岩夹燧石岩层中钻进，效果如表。
A total of four sets of this drill set of alloy, a group of four alloys. In front of the two alloy at the end of the blade is 2 to 1.5 mm, behind the two alloy at the end of the blade than the first two alloy bottom edge of 0.5 to 1 mm high. When the latter two alloy worn out, the two low alloy front edge work continued. But behind the alloy work, the contact area with the rock is small, so the pressure should be small, generally about 1700 ~ 2000 kg. The front two alloys continue to work, before and after the two teeth are in contact with the rock, so the contact area should be increased. Pressure is generally about 2000 ~ 2500 kg. Alloy specifications 7 × 15 mm. In 7 to 8 limestone clathrite rock drilling, the effect is as table.