Easy-to-use electric 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 into the 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. Binds up to 425 sheets. Maximum comb size is 2".