Milwaukee QUIK-LOK™ 5-1/2" x 7/16" Holesaw Extension is designed to fit shanks with or without a power groove, making it a versatile addition to your toolset. This extension is impact-rated for increased durability, ensuring it can withstand tough job site conditions. It also features a tool- design that allows for fast and easy bit changes, enhancing your efficiency and convenience during work. Model Number: 48-28-1030