固定直径扩孔器由优质合金钢经过热处理制成，其强度高，性能可靠。轮臂易磨损部位经过表面硬化处理并焊于本体上，其上安装有可更换的牙轮。牙轮有三种类型：SM型用于软地层至中硬地层；MH型用于中硬地层至硬地层；XH型用于硬地层。该扩孔器上有三个或六个装有可换合金喷嘴的喷管，这样，可形成喷射液流迅速清洁扩大的井眼。

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the fixed diameter hole opener is made of tough heat treated alloy steel for maximum strength. cutter arms, equippe with removable cutter, are hardfaced and welded on body. cuttersn are avaibalbe in three types: type SM for soft to medium formation, type MH for medium to hard formation and type XH for hard formation. the hole openers have three or six jet tubes with replaceable nozzles, so that jet streams quickly clean the enlarged hole.