Used for drilling ceramic materials after none of my many different brand drills ever got through to me and then I bought a sample from Revain, 2 brands each advertised drilling through has ceramics: it's a BOSCH GT2000 with a carbide tip and a mark with the odd name "DKIBITH" (golden color). This brand of Bosch has NOT penetrated ceramics! But the brand with the odd name "DKIBITH" quickly found its way into ceramics. And this other brand is as cheap as Bosch. I'm glad I didn't just buy a Bosch!