Ideal for piercing or marking for starting drills in metal and other materialsmade of alloy steelheat treated for strength and durabilityblack oxide finishamerican made productmayhew 3/8 in.; x 5 in.; center punch is made of alloy steel for strength and durability and coated with a black oxide finish for resistance against rust and corrosion. since 1856, our punches, chisels, and pry bars have been the go-to tools for oems and professional mechanics throughout the country. and while our company has grown to meet the needs of the professional market, as well as those of the do-it-yourself automotive enthusiast, our focus has never changed – leveraging our strength to build your business.