Ftted with a very high temperture For drilling in granite, concrete, stone, masonry, tiles and marble. FOUR SQUARES SHANK HAMMER DRILL BITS1. Machined from chrome steel fitted with carbide insert brazed at a very high temperture 2. L-shaped flute profile improves dust discharge sand blasted surface.3. For drilling in granite, concrete, stone, masonry, tiles and marble.4. Sizes: 6.0-30.0mm; Total ...