Masonry drill bits,TCT drill,Din8039 .Surface treatment: Zinc Placted,Tin Coated,Chrome Plated. Masonry drill bits,TCT drill,Din8039 . For drilling in concrete, rock, stone, masonry, marble and breeze ... Coated,Chrome Plated.Size: diameter from 3mm-25mm.High-helix Masonry drill available. Masonry Drills,hammer type with tempered body available