This set includes a high-quality driver bit, stop collar, and hex wrench for the Kreg Deck Jig Concealed-Fastening System. It's perfect for adding a spare bit or replacing a worn one. The driver bit features a #1 KTX drive with a hex shank that fits all standard 1/4" chucks and offers Quick-Change Chuck compatibility for fast bit changes. Kreg offers premium home improvement and woodworking tools designed to help you achieve your DIY projects.