Bosch DD400 4-Inch Premium Segmented Tuckpointing Diamond Blade Ultra-efficient and fast sandwich-blade design Durable design-connected blades optimize performance over stacked blades with washer Up to 3 times longer life with premium diamond formulation for aggressive removal Typical applications are mortar and grout removal Diamond blades appropriate for cutting special materials such as soft abrasive 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 tuckpointing blades include mortar removal in brick buildings and grout removal in commerical tile applications that include waste water treatment plants and subway tunnels Diamond blades appropriate for cutting special materials such as soft abrasive, soft brick, asphalt, green concrete, duct tile, iron / rebar, marble and tuck-point mortar are conveniently color coded in red