The Milwaukee 42-66-2810 Chuck Kit helps securely hold and grip compatible drill bits and accessories during tool operation. This replacement kit provides the clamping function needed to keep the bit properly positioned while drilling or fastening. A properly functioning chuck supports stable bit retention, smooth operation, and convenient accessory changes. Replacing a worn or damage... https://www.wholetoolbox.com/milwaukee-42-66-2810-chuck-kit/42-66-2810.html