Durable Material: Tungsten Carbide Head, High Speed Steel Shank. Sizes: Total Length – 40mm; Shank Diameter – 3mm; Tip Outer Diameter – 2.7mm, 2.8mm, 2.9mm, 3mm, 4mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.2mm, 5.9mm, 6mm, 7.6mm, 8mm; Blade Length – 0.8mm, 1.3mm, 1.9mm, 2.3mm, 2.6mm, 3.2mm, 4.4mm, 7mm, 7.3mm, 7.5mm. 8mm, 9.3mm, 9.6mm, 10.5mm, 11mm, 12mm. Various Uses: Ideal for processing all kinds of materials such as wood, plastic, foam, resin models, etc. Includes 20 different tools: burrs, grinding head and milling tools, etc. Meets most of your drilling requirements, perfect for engraving, chamfering, grooving, boring and hollow machining. Compatibility: The rotary burr kit can be machined with most grinders and engraving tools – such as: suitable for Dremel, Proxxon, suitable for Mister Tool, suitable for Einhell and similar machines.