"WHOLESALE HAND TOOLS: 4 PIECE MASONRY DRILL BIT SET. IIT. Tough tools for tough jobs! Heat treated carbide tips are excellent for working with brick, concrete, and masonry materials. These bits may be used with corded and cordless power drills. Illinois Industrial Tool 4 piece masonry drill bit set includes bit diameters of: • 3/16'' • 1/4'' • 5/16'' • 3/8'' Wholesale, 96 per unit.