Review on 🔥 High-Performance Jashtool Diamond Ceramic Cooling Porcelain Cutting Tools, Ideal for Hole Saws & Accessories by Frankie Wesley

Excellent bits, 6mm fits easily through 16 holes in hard-paste porcelain. First tip is to knock out the wax insert, it's useless and the porcelain will plug the bit in place with wax. Continuously use water from a spray bottle, not sure how well they dry, maybe not very well.