Set 3 spherical and conical diamond wheels, with 's spherical and tapered diamond mini drills, it is possible to perform different fine works, such as engraving, outline machining and deburing. the kit contains two spherical minimuels with diameters of ø3 and 5 mm as well as a conical minimueling with a 3.5 mm diameter. with their diamond coating, they are perfect for machining hard materials, such as ceramic, glass, tile and non-ferrous metals, and convince thanks to their high dimensional stability and long service life. with their 3 mm shank, the diamond mini-drills can be easily mounted on drills, cordless screwdrivers, flexible shafts and mini grinders