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WL Type Integral 3-Spiral Blade Stabilizer, WL Type Integral 4-Spiral Blade Stabilizer (string type, near bit type ). The working hardfacing surface (also called as wall contact )materials available separately are (1) carbide insert, (2) Inserted diamond compound, (3) Low temperature brazing tungsten carbide slug, (4) Surface bead welding abrasive welding rod, etc. Bit size (in)   Working OD   OD of body   ID   Length   Thread code on both ends   String type   Near bit type   Top   Down   Top end   Down end   6   152.2   121   51   1200     NC38   3 1/2 ″ REG   6 1/4   158.7   6 1/2   165.1   7 1/2   190.5   159    57   1600   NC46   4 1/2 ″ REG   7 7/8   200   8 3/8   212.7   159 165   71   1600 1800   NC46 NC50   8 1/2   215.2   159 165 178   8 3/4   222.2   9 1/2   241.3   178 197   1600   NC50   NC50   NC50   9 5/8   244.5   1800   6 5/8 ″ REG     9 7/8   250.8   12 1/4   311.2   203 229   76   1800   NC56 3 1/2 ″ REG   NC56 6 1/2 ″ REG   NC56 3 1/2 ″ REG     6 5/8 ″ REG   17 1/2   444.5   229 241.3   2000 2200   NC61 7 5/8 ″ REG   NC61 7 5/8 ″ REG   NC61 7 5/8 ″ REG     NC61   7 5/8 ″ REG   24   711.2   26   660.4   28   711.2                         Model: HF2000, 3000, 4000 Productivity: 5000 Trademark: TIANHE