IRWIN® cordless drill bits are ideal for drilling the most common materials, including brickwork, breeze block, wood, dry wall, slate, plastics, sheet metal. • Designed for cordless low speed multi-purpose drilling. • For rotary drilling only - no hammer or percussion. • The perfect drill bit for drilling ceramic tiles - doesn't walk or fail even in hardened floor tiles. • Unique four-facet ground carbide tip for lower drilling pressure and perfect centering.