1.[Fast and Precise Drilling] This highly magnetic screwdriver bit set features a 4-tooth wave design for fast and clean drilling. Made of carbide tips and high hardness materials, it stays sharp and lasts longer, making it ideal for masonry drills on concrete and hard surfaces. 2.[Smooth Chip Removal] The spiral groove design keeps the concrete drill bit cool while pushing out debris to prevent sticking during drilling. Works great with hammer drill bits and rotary tools. 3.[Non-slip Hexagonal Shank] The hexagonal handle fits securely into drill bits and screwdrivers, while the sharp cutting edge increases efficiency. Ideal for cement drill bits for concrete and brocas para concreto. 4.[Sturdy] Made of durable alloy steel, this masonry drill bit set is wear-resistant and perfect for tile drill, ceramic drill, and glass drill jobs. 5.[Suitable for Multiple Surfaces] Suitable for impact drills, regular drills, and screwdrivers. Suitable for cutting brick, stone, wood, and concrete. For harder materials like marble or diamond drill bits, use water cooling.