7/8X13-1/2 inch SDS MAX Masonry Drill Bit Featuring a carbide tip that maximizes surface contact and a U-flute to clear debris, DEWALT SDS Max Masonry Drill Bits arent just fast, theyre ultra-durable. An open-head design channels dust into flutes for efficient drilling, and a hardened core helps to reduce bit breakage. DEWALT carbide tip design maximizes carbide surface contact for longer bit life. U-Flute cleans debris out for fast, efficient drilling. Open head design channels dust into flutes for quicker drilling.