Drill America SDS4F Series Carbide Tipped Hammer Drill Bits are designed for drilling stone or concrete. These carbide-tipped tools feature cutting edges of carbide for wear resistance and a steel shank for extra toughness. These premium SDS Drill Bits are auto-weld manufactured with a 4-flute cross tip. The 4-Flute Cross Tip vibrates less and makes rounder holes than standard SDS bits. The wide 4-Flute Cross Tip also allows for faster dust removal and reduced heat producing more holes than standard SDS bits. SDS-Plus Shank for use with SDS-Plus drills only.