Bosch DD4510H 4-1/2-Inch Premium Sandwich Tuckpointing Diamond Blade By combining all segments and a superior diamond/metal mix with an ultra-efficient and fast sandwich-blade design Durable Design - Connected blades optimize performance over stacked blades with washer Up to 3 times Life - Premium diamond formulation for aggressive removal Typical applications for tuck pointing blades include mortar removal in brick buildings and grout removal in commercial tile applications that include waste water treatment plants and subway tunnels