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From the Manufacturer 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. Spring tension cap can be adjusted for light to heavy strokes. Punch depth can be set for repetitive work. This is a steel automatic center punch for making lighter markings than #78. It has a black oxide finish that inhibits rust. The all-steel body is 5" with threaded, replaceable hardened steel point and shaft. The body diameter is 1/2".