The DeWalt DT4957-QZ 29pc HSS E Cobalt Set in a Plastic Cassette is designed for exceptional drilling performance. It offers a 50% increase in drilling speed and double the resistance to breaking, making it ideal for challenging materials like stainless steel. With 4 times the lifespan of standard bits, this set provides durability and efficiency for both professional tradespeople and DIY enthusiasts. The inclusion of 3 flats on the shank prevents chuck slippage, ensuring secure and precise drilling. All bits are housed in a practical plastic cassette for easy organization and transport, reflecting DeWalt's commitment to quality and performance. Experience enhanced drilling tasks with this reliable addition to your toolkit. Key features and benefits include a 50% drilling speed improvement, double breaking resistance for stainless steel, and 4x longer life than standard bits. The design caters to both professionals and DIY users, offering robust efficiency. The 3-flat shank ensures secure and accurate drilling by preventing chuck slippage. The plastic cassette provides convenient organization and portability.