Kaufmann special drill set with 8 mm diameter contains a drill bit for dry drilling of hard but brittle materials such as ceramic tiles up to hardness no. 9 or glass. Thanks to the use of tungsten carbide and the special drill edge, it is suitable for very precise drilling without the need for additional cooling. It is recommended to drill at a maximum of 200 rpm without tapping. The second drill bit is designed for precision drilling in concrete. Drill bits are sold in plastic packaging.