This spring loaded auto-centering punch auto centers holes for screws for hinges & hardware. To operate, place the bevelled tip in the countersunk hole of the hardware, & then press down on the handle until the built-in mechanism strikes a blow. By this simple process, you obtain truly concentric starting holes every time. This eliminates the risk of drilling off-center, causing screws to pull hinges & hardware off-center.
Product Diameter of Tip Tool Diameter Overall Length Model # Auto Hinge Punch 3/8" ~ 60º Angle Point 5/8" 5" STR-819