KUTZALL burrs are the perfect companions for your rotary carving tools, designed to work easily and efficiently where other conventional tools fail, they perform with remarkable wear-life and provide a truly unique combination of superior material removal and surface quality. With effortless operation (with or against the grain) and resistance to loading, you'll use them project after project. Their outstanding performance on a wide variety of materials will keep them locked in your favorite grinder. Wood, plastic, drywall, rubber, fiberglass and soft stone, they will be your go-to workhorse for any task. NOTE: Not for use on metals, ceramics or hard stones. Includes extra slot for tool storage. 'Original' Structured Teeth-Creates a smooth cutting action and is easy to control works exceptionally well on harder woods. Diameter and head length dimensions on KUTZALL burrs are base dimensions. The coatings add approximately .060 in., to 102 in. Compatible with popular grinders with 1/8 in. collets or adjustable chucks including: Dremel, Foredoom, Ryobi, DeWalt, Milwaukee and more. Recommended operating speed range is 10,000-25,000 RPM. They will remove material at lower speeds (hand drills, drill presses) but both material-removal rate and control improve as speed increases. Cleaning: They can be easily cleaned using a torch and/or a quick few passes with a soft wire brush, the heat will not harm the teeth.