Made of high quality steel with high carbon content, durable and rustproof, long life. By high-frequency quenching heat treatment, high hardness. The countersink is suitable for wood, plastic, other materials with low hardness to form holes. Suitable for cordless drilling machines and hand-held screwdrivers with round-up, such as drilling machines from Hilti, Bosch, Makita, Hitachi, Fein, AEG, Metabo, DeWalt, Black & Decker, Brüder Mannesmann. The scope of delivery includes a 12 mm, 16 mm and a 19 mm counterbore drill, different sizes offer you a wide choice. The sinker of 12mm, 16mm and 19mm size is ideal for making wooden planks, fiberboard, chipboard, plywood, plastic, aluminum board, etc. Universally applicable, lowering and deburring without chatter marks. Suitable for DIY, home and general building to development. Product Information Material: steel Size: ca.12mm x 39mm, 16mm x 42mm, 19mm x 44mm Recording diameter: 6.00mm package 1 x 12mm countersink 1 x 16mm countersink 1 x 19mm countersink