Try these guys out. I bought a few bits to cut porcelain tile already installed for some HVAC ducts. Dry cut...they went through it like hard butter. Grout is going to be a field day for these bits.
Industrial Contractors Supplies, Inc.
- Dust Director Division -
15061 Route 30 N. Huntingdon, PA 15642
Ph: 412 . 824 . 6933 Fax: 412 . 824 . 4704 www.dustdirector.com