Bosch DBSW4561 Speedwave 4.5" Segmented Diamond Blade. Features Superior laser fusion production technology (patented) optimized distribution and integration of diamonds Unique wave shaped segments (patent pending) reduced friction on side faces Unique cooling disc with vibration-damping benefits reduces blade temperature more running smoothness World-class in speed & life Extremely robust and outstanding lifetime suitable for some metal. Includes Speedwave 4.5" Segmented Diamond Blade - DBSW4561 Product Manual.