Bosch OSL234HG Starlock Oscillating Multi Tool Hybrid Grout Blade, 2-3/4" StarlockMax accessories are only compatible with StarlockMax tools Premium carbide grit coating for long life in grout and tile applications Hybrid teardrop design for use in both grinding and rasping Color coded interface and laser etched blade to quickly identify the right blade Starlock interface for professional performance, also works with OIS compatible tools including Bosch, Fein, Milwaukee, Makita, Rigid, others Precision Swiss made blade