SAD-B35 Binding Machine for Plastic Comb and Metal Wire 500 sheet Binding for up to 500 sheets for 2 plastic comb and 320 sheets 9/16 3:1 wire; Hole punching capacity for up to 20 sheets letter size paper format; Build in plastic comb and wire guide; Adjustable paper guide for vertical paper loading; and Build in waste bin for punching chips.