Your standard drill bit skips and walks across the surface of concrete — burning time, ruining hole geometry, and killing bits. For real concrete and cinder block work, you need a dedicated masonry bit that handles the impact action of a hammer drill without walking. 1/2-inch shank fits standard SDS or conventional hammer drills. 12-inch length for drilling entirely through concrete walls and cinder blocks in a single pass — no stopping to chip out a partial hole. Tungsten carbide tip bonded for impact resistance — the carbide takes the hammering without chipping or cracking. Standard on concrete contractors and masons across northeast Nebraska and northwest Iowa for anchor bolt holes, sleeve drilling, and mechanical rough-in through poured walls. In stock at Crofton Lumber (Crofton, NE) a Stocked at Crofton Lumber and Akron Lumber.