SDS Drill Bits Tungsten Carbide Tip. Finish: Sand Blasted. -Specially designed ground tungsten carbide tip. -Heat treated to increase the life span of the drill bit. -Unique design, double slot chuck system, preventing drill seizure. -Sand blast finish for increased durability. -Specialist flute design enabling effective dust extraction, increasing drilling speed. -For use with SDS percussion drill machines. -Suitable for drilling stone, brick, concrete and most types of masonry.