CARL Extra Heavy-duty 3-hole Power Punch - 3 Punch Head(s) - 300 Sheet of 20lb Paper - 9/32" Punch Size - Steel - Platinum Sturdy, metal punch easily drills the standard, 9/32" three-hole punch, pattern through 300 sheets of 20 lb. bond paper. Hollow punch heads make punching easier. Punch is preset for standard three-ring binders. Design features adjustable margin depth selector and centering guides. Large-capacity waste tray is easy to empty. Three-hole punch is made of heavy-gauge steel construction.