The CARL Heavy-Duty 3 Hole Punch CUI63300 is a sturdy, metal punch designed for durability and efficiency. It easily drills the standard 9/32" three-hole punch pattern through up to 300 sheets of 20 lb. bond paper. The hollow punch heads facilitate easier punching, and the punch is preset for standard three-ring binders. Features include an adjustable margin depth selector, centering guides, and a large-capacity waste tray that is easy to empty. Constructed from heavy-gauge steel, this three-hole punch is built to last.