Rubi Stone Cup perfect for buffing work on any type of natural stone, especially granite and marble, and cured concrete surfaces.

4 in. diameter.

The RUBI diamond burr is perfectly compatible with portable electrical grinders and polishers for both wet and dry work.

With a 5/8" thread for direct connection to practically any electric grinder or polisher on the market.


The RUBI diamond burr works at a maximum speed of 15,000 rpm.

RUBI uses high quality diamond in all its diamond tools, ensuring the proper functioning and ensuring optimum product performance.

The design of the diamond burr offers the construction professional comfortable and vibration-free use. Perfect for excellent results in grinding work on surfaces made of natural stone and cured concrete.

The orientation of the spiral-shaped diamond segments facilitates the evacuation of debris produced by buffing the material, providing professionals with high speed working on any kind of surface, while also obtaining optimum performance.

RUBI is committed to quality. All our products and tools are subjected to rigorous quality tests by experienced professionals. We want all the products we have on the market to be recognized for their quality and durability. This desire has made our brand one of the most highly valued in giving quality solutions to tile installing and building professionals.

The RUBI training approach with professionals is very plain, a clear example of this being that since the inception of the company participation at international fairs has been vital to its development. At RUBI a great deal is invested in participation at international fairs and exhibitions, which means that our global recognition continues to grow and we can continue to develop solutions to facilitate the work of industry professionals worldwide.