- HSS Straight Shank Twist Drills, Roll Forged, DIN 338, HSS 4241 (BLACK FINISHED, BRIGHT FINISHED, AMBER FINISHED) Sizes: (0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm,...........,20.0 mm) - Masonry drill bits, Zinc Coated, --Roll forged ,common masonry drill--red tips - Masonry drill bits, SandBlested, Roll forged - SDS-Plus Hammer Drill Bits, Double Flute, Sand Blested Color, |