This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Cross section of Jackhammer bit showing layered internal construction. en cross section of jackhammer bit The bandsaw that made the cut leaves saw marks which cut deeper into the softer layers of metal and shallower into the softer metal revealing the layered internal construction similar to the layered construction of Japanese sword