The NSP1 Slate Punch produces a clean, recessed nail hole in 4 ヨ 8 mm natural roofing slate. A big 2-1/2-inch (63 mm) throat depth allows convenient placement of the punch tip on the flat, unfinished side of the slate to create a desirable nail hole recess on the natural finished side as it punches through. Hardened all-steel construction with rust-resistant nickel plate and black oxide finishes ensures long service. The tool steel punch component is also replaceable.