Hole-saw drill bits are designed to bore holes in hard concrete materials. Characteristics .. 6 cemented 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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