Auger bit
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3 bladed auger bit with diameter of 75 mm is used with auger diameter of 62-64 mm with 17 mm hexagonal connection.
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Auger bit 2 blade diameter 198 mm used with auger diameter 180 mm hex 55 mm connection
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Auger bit 3 blade auger with a diameter of 250 mm is used with auger diameter 230 mm hex 55 mm connection.