Klein Tools Center Punch

Four sizes, each a different shank diameter paired with an overall length: 1/4-inch shank at 4-1/4 inches (66310), 5/16-inch at 4-1/2 inches (66311), 3/8-inch at 5 inches (66312), and 1/2-inch at 6 inches (66313). Bigger shank means more mass behind the strike, so the 3/8 and 1/2-inch punches suit heavier steel while the 1/4-inch handles light sheet metal and layout work in tight spots.

For marking a drill start in sheet metal or an enclosure knockout layout, the 5/16-inch by 4-1/2 inch punch (66311) is the general-purpose pick, and the 1/4-inch by 4-1/4 inch (66310) gets into tighter spots. Both have ground, heat-treated points that hold a sharp tip so the dimple stays where you put it and the bit does not walk. Step up to the 3/8-inch (66312) or 1/2-inch (66313) only when you are punching thicker stock and want more mass behind the hammer blow.

The 5/16-inch figure is the shank diameter, not the tip. On the 66311 that 5/16-inch shank runs to a 4-1/2 inch overall length and tapers to a ground point. So if you are matching a punch to a hole size, ignore the 5/16 number, it describes the body you grip and strike, not the dimple it leaves.

High-carbon steel with a corrosion-resistant black finish, so it tolerates a truck bed or a damp mechanical room better than a bare bright-finish punch. The body is built for repeated hammer impact and the points are heat-treated. Made in USA.

Yes, it is a struck tool, built with a rugged body for impact strength and heat-treated points. Always wear approved eye protection when using it, since punching metal throws chips.

No. Each Klein center punch is a single solid tool ordered by diameter and length, with no tips, inserts, or handles to specify. You supply the hammer. If you want more than one size on the truck, order the part numbers separately: 66310, 66311, 66312, or 66313.