This 10-piece Amtech impact screwdriver bit set features 50mm bits designed for both woodworking and metalworking projects. They are impact grade with a black oxide coating for enhanced durability. The bits come with a 1/4" quick-change hex shank for easy and convenient bit changes, making them suitable for use with corded or cordless impact drivers. This set is ideal for professionals and DIY enthusiasts alike, providing versatility and efficiency for various tasks.