Easy-to-use manual comb binder is suitable for office use. Easy-to-use push-button electric punch features exclusive "Paper Centering System" aligns paper for perfect punching every time. Exclusive "Paper Separator" divides your stack of sheets intothe right thickness for punching every time. Rotary dial for precise control of comb opening and closing. Punches up to 25 sheets of 20 lb. bond letter-size paper. Easy-to-use full-size punch handle serves as a carrying handle. Binds up to 450 sheets. Maximum comb size is 2".