The NHP1R Punch makes a generous 5/32 x 3/4 in. (4.0 x 19.1 mm) horizontal slot for adding or elongating nail holes in vinyl and .019 in. (0.48 mm) aluminum siding to accommodate irregular stud spacing. Constructed of hardened steel stampings and rugged investment cast alloy steel jaws with rust-resistant nickel plate and black oxide finishes to ensure long service life.The Malco NHP1R Nail Hole Slot Punch also features ergonomic RedLine Handle technology. An Engineered handle opening compliments the natural power stroke of any users hand and maximizes the powerful 7:1 mechanical advantage of compound-leverage head to handle linkage. Comfortable handle grip contours, a non-slip grip insert, spring handle actuation and a thumb-operated handle latch ensure a natural fit and feel for comfortable one hand operation anywhere on the job.