Material: Carbide, High Speed Steel, Durable Arbor: 1/8 inch (3 mm), Length: 8/5 inch (40 mm) Can be machined with most grinders and engraving tools, e.g. Dremel, Proxxon, Mister Tool, Einhell and similar machines Perfect for processing all types of materials such as wood, plastic, foam or resin 20 different tools, including: milling cutters, grinding head and milling tools, etc. Meet most of your drilling needs, suitable for engraving, chamfering, chamfering, grooving, boring, hollow shaping Note: The data are all measured manually, please allow 1-3cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.