The Mayhew Tools 10600 Pro Diamond Point Chisel, 1/8-Inch, is used to make a v-shaped groove in metal and provides a sharp pointed bottom to the grooves. A Black oxide finish helps rust prevention. 5-Inch OAL; 0.125-Inch Point Size; Hex Body Type. Manufactured to ASME B107.410 specifications. Founded in 1856, Mayhew Steel Products (Mayhew Tools) is the oldest punch and chisel manufacturer in the United States. As we've grown from a small tool house to the industry leader, there's only one thing that hasn't changed—our dedication to quality, reliability, and craftsmanship. That's why we've become the tool of choice for certified technicians and professional mechanics across the country, and have found a home in the belts of do-it-yourselfers as well. Over time our product line has grown but our passion for manufacturing quality hand tools continues as we serve the Industrial, Automotive and Hardware industries. Mayhew is ISO 9001:2015 Certified.