Greenlee 229 Knockout Punch Unit, 9-Pin D-Subminiature
Punch, die unit, draw stud, square counter nut, drive nut contents; 16 gauge mild steel, 10 gauge aluminum capacity; 0.787 inch x 0.982 inch x 0.469 inch hole size; round punch type; Greenlee Brand; Number Of pins 9; minimum pilot hole diameter 7/16 inch