The curved claw is the working end of the crowbar, which is specifically shaped for driving and pulling nails. Its curvature allows for easy insertion under a material, such as a board or rail, and subsequent hooking. The curve creates an effective lever that multiplies the user's force, making it easier to separate joined materials or lift heavy objects a short distance. The claw usually includes a cutout, often in the shape of a "V", which is used to hold the nail head. Once the nail is caught, the crowbar uses its curved shape to rest on the surface and pull the nail out of the material in a smooth, rocking-like motion. This shape therefore combines the levering function with the function for pulling out fasteners, making it suitable for demolition, construction and carpentry work.