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5/16" x 4-1/2" Masonry Industrial Drill Bit, Carbide Tip$3.99 As low as $3.69This industrial-grade 5/16" x 4-1/2" masonry drill bit is engineered for high-performance drilling in concrete, brick, and block. It features a durable tungsten carbide tip for extended life and precision, manufactured to meet ANSI B212.15 standards. Learn More