Pro Project Carbon Steel Putty Knives and Scrapers. High-quality tools with an over mold comfort grip and Hammer Head end for resetting popped nails and screws. Carbon steel blades are hardened for durability. Pro Project Tools from Hyde feature patent-pending design, straight-ground blades for flexibility, carbon steel blades, hardened for durability, Differentiated over mold handles for scraping and spreading, die-cast Hammer Head for setting nails and positioning boards and also Brass blade options are available.