SL stands for Single Layer. Our registered trademark of STAR LAYER represents a tool that has a single diamond grain layer fixed with a brazing filler metal on a precision-processed base metal. Compared with an electroplated diamond tool, the STAR LAYER holds diamond grain more strongly and has a greater grit exposure. The grain array can be adjusted to cover various uses from pre-finishing to finishing. Given its shape, the STAR LAYER can be flexibly used for various tools.