适用于软至中硬地层。
适用于中硬地层，是适应性较广的取芯钻头之一。
Suitable for medium hard formations. It allows to be used in a wide variety of formations.
适用于中至中硬地层中使用，如砂岩、石灰岩及白云岩。
Suitable for medium to medium hard formations such as sandstone, limestone and dolomite.
高抗压强度的中硬地层，如硬页岩。石灰岩。砂岩。白云岩。和硬石膏。大理石。
Medium hard formation with high compressive strength. Such as hard shale, limestone, sandstone, dolomite, anhydrite and marble.
高抗压强度的中硬地层，如硬页岩。石灰岩。砂岩。白云岩。和硬石膏。大理石。
Medium hard formation with high compressive strength. Such as hard shale, limestone, sandstone, dolomite, anhydrite and marble.
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