Fellowes Model pb2450 plastic comb binding machine Model PB2450 Plastic Comb Binding Machine Model PB 2450 is ideal for heavy duty projects and general office use. 25-sheet punching capacity; 500-sheet binding capacity. Vertical paper loader for continuous punching and binding. The margin depth selector ensures proper hole placement for thick documents and the adjustable edge guide makes centering documents easy. Releasable dies provide proper punch alignment for different paper sizes. Comb diameter selector helps the user select comb size and margin depth at a glance. Memory brake sets combs to the same opening width when binding multiples. Front waste drawer. Includes binding starter pack.