Ceramic Master 3900 drill bit Drill bits for ceramics, tiling, hard-burned tiling, glass, acrylic glass and mirror glass. Precise drilling-in plus quick and and material-protecting propulsion. -Regular regrinding is required when working on hard materials- IMPORTANT: For rotary use only (at a low speed) Sufficient cooling is required! Diameter: 4.0 mm Total length: 75 mm https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2021-04-26 https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2021-05-24 https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2022-01-18 https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2022-07-19 https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2023-01-29 https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2023-03-12 https://elecena.pl/product/17885132/50092-0-ceramic-master-3900-drill-bit-75-mm-4-0-mm 2025-11-14