Hole reamer bit  are designed for the enlargement of pilot holes and large hole applications. They are also used for road and river crossing application. 
Constructure

The hole openers are manufactured from AISI 4145H fully heat-treated alloy steel. All are available with carbide-milled teeth and insert cutters. Arms and cutters are hardfaced for protection in three different designs for varying conditions and rock formations. The design of the hole opener allows for field-changing the cutters. They has a wide range of hole opener types, including. 

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