Diablo, 2-3/4" Starlock carbide oscillating blade for grout and mortar. Diablo's Starlock oscillating sanding blades feature application specific designs that deliver maximum durability and longer life in grout, mortar and tile adhesive removal applications. The 40 grit sanding plate removes material and routes joints on wall and floor tiles. A carbide grit tip removes grout and mortar from hard to reach areas and tight corners. Tool free quick-change interface fits Fein and other Starlock tools, also compatible with most Non-Starlock multi-tools.