General Tools - 806 Self-Centering PunchFast, simple technique of centering screw holes. Use o n hinges, hangers, locks, lock strikes, switch plates where countersunk hole already exist and countersunk Place punch in countersunk hole and the tapered end automatically finds center. Just tap the plunger pin the screw hole will be straight and absolutely centered. Made of steel with spring positioning, sliding tempered steel pin, cadmium-grip plated. No. 806: Punch body made of Steel. The carded package contains a quantity of 1 | The Jenks Industrial SKU is 304405