GZ25000 - Automatic Centre Punch - General Duty ACP-1 - Useful For Light Marking Jobs The depth of the impression is variable and can be adjusted from light marking to heavy blows by turning the knurled head. Screwing the cap downwards produces heavy indentation; progressively lighter marking can be obtained by screwing the cap upwards. Once the knurled cap is set to the desired position the punch will strike the same depth every time. These have a round shank with clean and well cut knurling for positive nonslip grip. Tips are made from hardened tool steel and can be easily removed for re-sharpening or replacement. Length: 4-3/4 inch (120mm) Body Diameter: 33/64 (13mm)