Makita (B-66313) 3‑1/8" x 24" SDS‑MAX TUNNEL BIT

Ideal for drilling large holes in masonry where the depth of the hole exceeds the depth of a standard core bit)Solid tungsten carbide head)Two flute design for faster clearance of debris)Solid one piece system transfers power directly to the end of the bit)Asymmetrical tungsten carbide teeth for faster drilling and longer life)Carbide-tipped centering point helps reduce bit walking for more accurate drilling)Larger diameters than standard carbide bits which allow smaller hammers to drill larger holes)For making through-holes in masonry for piping, ventilation and electrical installations)For use in concrete, block and brick)24" overall length; 18" usable length)For use in rotary hammers that accept SDS-MAX bits)