SAD-B30e Electrical Binding Machine for up to 2'' Plastic Comb 500 sheets Binding for up to 500 sheets and 2 plastic comb; Electrical hole punching capacity, with remote control, 19-holes, for up to 23 sheets letter size or extra larger paper format; Dual punching system, rectangular and round; Adjustable paper guide for vertical paper loading; and Build in waste bin for punching chips with acoustic alarm when full.