This set of screwdriver bits is manufactured from chrome vanadium steel and has a 1/4" hexagonal shape, making it suitable for use with most standard drill chucks. The set includes 10 bits in a range of sizes and styles, including slotted bits in sizes 4, 6, and 8mm, Phillips bits in sizes #1, #2, and #3, Pozi bits in sizes #1, #2, and #3, and a magnetic bit holder. These bits are suitable for a variety of screwdriving tasks and are an essential tool for any workshop or toolkit. Whether you are a professional contractor or a DIY enthusiast, these screwdriver bits are an excellent choice for all your screwdriving needs. With their high-quality construction and precise design, these bits are sure to provide reliable performance for all your screwdriving tasks.