Hardy tools, also known as anvil tools or bottom tools, are metalworking tools used in anvils. A hardy has a square shank, which prevents it from rotating when placed in the anvil's hardy hole. The term "hardy", used alone, refers to a hot cutting chisel used in the square hole of the anvil. Other bottom tools are identified by function. Typical hardy tools include chisels and . They are generally used with a matching top tool.