General Tools & Instruments 78 Heavy Duty Steel Automatic Center Punch
Use automatic center punches to precisely punch material for drilling and layout work.  Spring operated tool drives hard point in a single one-handed operation that eliminates striking a punch with a hammer. This is a heavy-duty steel automatic center punch with a black oxide finish that inhibits rust.  The all-steel body is  6" with threaded replaceable hardened steel point and shaft.  The body diameter is 5/8".