Spectrum Superior Superfast Helix Dry Diamond Core Drill Concrete, Brick, Clay. The Ox BX10 Spectrum Superior Superfast Helix Dry Diamond Core Drill is an incredibly tough drill with a reliably long working life. The dry diamond core can work with an extensive range of materials including clay, engineering bricks, and concrete made from limestone aggregate. This tool is ideal for trade professionals and DIY enthusiasts. Universal dry core for long life in most building materials including semi-engineering bricks, clay products, and limestone aggregate concrete. APPLICATIONS: all bricks, concrete blocks, general building materials, lightly reinforced limestone aggregate concrete, most natural stone. Tough, reliable, and long-lasting. Work with materials like limestone aggregate concrete, engineering bricks, and clay.