BOSCH tile drill bit set CYL 9 Ceramic, 5-piece, 4 - 10 mm, 2608587169 (tool)
Taking into account a slow speed and that it is not too hot and that it must not be cooled with water keeps these drills in porcelain stoneware approximately two holes long. I've tried two drills. 1) The first held exactly 2.5 holes. This, I then exc