About This Upgraded 4-Flute Serrated Design for Superior Performance: Features four sharp flutes that enhance cutting efficiency and reduce slippage, making this masonry drill bit set ideal for fast, smooth drilling in tough materials like concrete and tile. 10-Piece Concrete drill bit set Sizes: Includes 10x 1/4" bits, covering a wide range of drilling needs from small DIY tasks to industrial projects. Versatile Material Compatibility: Perfect as a concrete drill bit and tile drill bit for various surfaces including glass, brick, ceramic, concrete, and tile, ensuring all-purpose use in household and industrial settings. Durable Black Coating for Longevity: Made with high-quality steel and a wear-resistant black finish to resist heat, friction, and corrosion, extending the drill bit life even in heavy-duty applications. Easy to Use and Organize: Comes in a sturdy storage case for quick access and protection, making the drill bit set convenient for professionals and DIY enthusiasts alike. Overview Material : Alloy Steel Cutting Diameter : 6.35 Millimeters Finish Type : Black Oxide Shank Type : Straight Brand : DECKRKAT