Bosch HS1809 1 3 4 In Square 16 Tooth Bushing Tool Bit Round Hex Spline Shank Heavy Duty Concrete Masonry Stone Aggregate Scabbler Surface Texturing Cross Line Lasers Acoustical Tile & Plasterboard Cutouts: Acoustical Tile & Plasterboard Cutouts: Slicing burr free circular openings in drop ceiling tiles and thick drywall without tearing surface paper or cracking plaster edges Universal Adapter Free Interface: Direct mount shank design fits major oscillating tool brands without requiring loose spacers or separate adapters let the native mechanical impact stroke of the breaker piston do the crushing work level irregular masonry humps