The depth adjustment rings from Stern are specifically designed for use with spiral drills and provide precise control over drilling depth. These rings are made from durable material and are ideal for woodworking. With a length of 14 millimeters and a diameter that ranges between 12.1 and 14 millimeters, they allow for flexible adjustment to various hole sizes, accommodating up to 14 millimeters. Each unit includes one depth adjustment ring, which comes with a screw to ensure secure attachment to the drill. This functionality makes the depth adjustment rings an essential accessory for professionals and DIY enthusiasts who want to achieve precise and controlled drilling in wood. The ease of use and the ability to quickly adjust the drilling depth contribute to efficiency and accuracy, making them a valuable addition to any toolbox.