Bosch HS1903 SDS-Max R-Tec Flat Chisel, SteelBosch R Tec technology for SDS max chisels use an energy diverting reflection element that increases material removal by 15 percent. Because the energy is dispersed back into the material, the tool and bit do more of the work with less vibration for the user. Highlights: Material: Steel Applicable Materials: Concrete Blade Thickness: 1 inch Flute Length: 14 inch Length: 16 inch Shank Diameter: 1 2 inch Shank Length: 2 inch Shank Type: SDS Plus R Tec