Mayhew Pro 10501 3/16-Inch Half Round Nose Chisel Also known as a gouge chisel Used for cutting round grooves in metal meets or exceeds ASME B107_401 and US govt GGG-C-313D Made in the USA. Lifetime Warranty. Made of alloy steel and heat treated for long life Also known as gouge chisels Used for cutting round grooves in metal Many specialized uses such as cutting semicircular grooves for oil ways in bearings Unlimited Lifetime Warranty Black oxide finish for additional rust protection