Contractors and DIYers, these UFFY impact bits are seriously tough! You get 10 six-inch long Robertson square #3 bits with 1/4 inch hex shanks that fit most impact drivers and drills. The S2 steel construction with 58-60 HRC Rockwell hardness means these bits can handle serious torque without stripping or breaking. The black manganese phosphate coating adds corrosion resistance and extends their life even further. The 6-inch length gives you great reach for working in tight spaces or driving long screws without your drill hitting the surface. Robertson/square drive is awesome because it grips screws tightly without cam-out, making your work faster and more efficient. Whether you're building decks, framing, or doing any project that involves driving lots of screws, these impact-rated bits will save you time and frustration compared to standard bits. The 10-pack means you'll have plenty of backups when you eventually wear one out. If you're tired of bits that strip easily or can't handle impact driver torque, these industrial-grade Robertson bits deliver professional performance at a very reasonable price.