Bosch 21 in Masonry Drill Bit for SDS Max Drill Blinds window shades Most reliable and efficient way Most reliable and efficient way to retrofit existing Linear Fluorescent T8 and T12 luminaires with simple rewiring necessary to remove the ballast office or dorm room Accurate hole diameter ensured by placing wear mark at the tip Inclined side cutters for aggressive drilling Short head gets dust out fast and reduces heat build up Active centering tip for optimum guidance when drilling in concrete and reinforced concrete Extremely robust and aggressive solid tungsten carbide S cutters Series Name N A Type Rotary Bit Length 21 in Shank Size SDS max Shank Type SDS max Compatible Tool SDS max drill Set Individual Individual For Use on Brick Yes For Use on Concrete Yes For Use on Rebar No For Use on Tile Yes For Use on Wood Yes CA Residents: Prop 65 Warning(s) No Bit Diameter (Inches) 1 1 4 in Maximum Drilling Depth 16 in