| http://www.w3.org/ns/prov#value | - Amazon.com $13.28 go to store Amazon.com Century 86420 5/16-Inch by 6-Inch Slow Spiral Masonry Drill Bit Slow spiral masonry drill bits are designed with a precision electronically brazed, special grade tungsten carbide tip for drilling brick, concrete, stone, slate, marble, tile, plaster and other masonry materials.
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