Master MP3 20-Sheet Three-Hole Punch, Oversized Handle, 9/32" Holes, Steel, Black Punches through up to 20 sheets of 20-lb. bond paper Oversized handle for easy open-handed punching Pre-set to punch 9/32 Inches diameter holes to fit a standard 3-ring binder Handle locks down for storage and safety Adjustable paper guide with large capacity paper chip pan