Hole-saw drill bits are designed to bore holes in hard concrete materials. Characteristics .. 6cemented carbide drill bits made of YG11C tungsten carbide, profiled and installed at an angle that enhances the efficiency of boring; .. body of the hole-saw drill bit made of high-quality CrV40 alloy steel;profiled body that enhances the efficiency of evacuating bore dust during drilling; .. additional enlarged diameters of 67mm and 83mm facilitate further installation of boxes in walls; .. handy plastic tube makes storage a lot more convenient.
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