Made of high quality high carbon steel, durable and corrosion resistant, long service life. By high frequency quenching heat treatment, high hardness. Countersinking is suitable for wood, plastic, other materials to form a low hardness holes. Suitable for cordless drills and hand screwdrivers with round grip, such as Hilti, Bosch, Makita, Hitachi, very good, AEG, Metabo, DeWalt, Black & Decker, Mannesmann Brothers. The package includes a 12mm, 16mm and 19mm large cutter different can offer a variety of choices. The countersink of 12mm, 16mm and 19mm size is ideal for wood planks, fiberboard, particle board, plywood, plastic, aluminum board, etc., for form holes. Universally applicable, reduce and deburr without Rattermarken.Verwendbar for DIY, home and public construction development. Features: Material: Steel Size: 39mm x ca.12mm, 16mm x 42mm, 19mm x 44mm Turned Diameter: 6.00 mm Package contents: 1*12mm counterbore 1* 16mm counterbore 1* 19mm counterbore Note: the data are all measurements manual, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received Shipping Quantity: (according to the main image)