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The reaming shell has been reinforced, making it ideal for the high-quality, deep-hole drill bit. This product is made with natural diamond and alloy which are embedded in a highly resistant matrix. As a result, its lifespan is 3 times higher than that of the ordinary polycrystalline reaming shell. Owing to the sharp edge, the natural diamond can work with drill bits to perform cutting in the hole, which helps to increase the drilling speed.