1" x 18" Cold Chisel SDS Max Shank The DeWalt 1" x 18" cold chisel SDS max shank is an extremely durable and useful attachment. Use this to increase your efficiency and decrease your work time. Superior build quality means you will be using this bit for years with minimal wear and tear. A must have for any professional or do-it-yourselfer. Features: For light chipping and chiseling of tile, mortar, glazing compounds, and other masonry products DEWALT is firmly committed to being the best in the business, and this commitment to being number one extends to everything they do, from product design and engineering to manufacturing and service.