Bosch HS1912 1 In. x 18 In. Flat Chisel SDS-max Hammer Steel For concrete removal, hard surface break up and chiseling Suitable for use on brick, concrete and loose stone Fits Bosch SDS-max hammers, competitive SDS-max driver hammers and Hilti hammers using TE-Y and TE-FY shanks (sold separately) 1 In. chisel width and 18 In. long SDS-max shank