MegaDrill multi-purpose drill bits are specially developed for drilling in a wide variety of materials. Each tip is individually diamond ground to give sharp cutting angles required for multi-purpose drilling and produces excellent hole quality. Carbide tip eliminates walking and the need for a center punch. MegaDrill bits are ideal for use in cordless drills, corded drills and drill presses. Drill bits can be used with and without percussion depending on material: Percussion must be used in concrete, brick, granite and stone. Rotary must be used in metal, wood, marble, ceramic tile glass and plastic.