This Bosch hexagonal shank hammer drill masonry bit has a 4 times greater lifespan than standard masonry drills. Its asymmetrical diamond-ground carbide bit delivers fast drilling and prevents damage to hammer drills and impact drivers that you use on a regular basis. The tip is specifically designed for precise starts and to reduce walking. The bit head features deep- cut spirals that let you quickly drill into block, masonry and concrete. This 1/4" x 6" drill bit is sold individually.