Based on this product's specifications, here are some alternatives and similar models
Chisel DeWalt DT6979 flat chisel 25 x 300 mm
Summary description:
Flat chisel DeWalt DT6979 with a 25 mm cutting width and 300 mm overall length. Designed for manual and powered hammer use, this flat chisel is suitable for removing material, shaping and cleaning joints in masonry, concrete and similar substrates. Robust steel construction and precision ground edge provide consistent cutting performance for demolition and renovation tasks.