Martin Yale EP210 Master Electric Hole Punch; Punches Up To 12 Sheets of 20 Pound Paper; Punches Standard 2-hole Pattern with 2 3/4 Centers; 1/4 Hole Diameter Punches up to 12 sheets of 20 lb paper; Automatic on/off; Punches standard 2-hole pattern with 2 3/4" centers; 1/4" Hole Diameter Adjustable paper guide for the most accurate punching; Includes reverse motor de-jam mechanism Large capacity paper chip pan; Comes with AC adapter or uses 4AA batteries (not included) Dimensions 4.75W x 5.75D x 3.5H inches, 1.2 pounds