HFS (R) 21-Hole Comb Punch Binding Machine - 250 Sheets Per Punch Easily create professional looking reports with quality binding, including front and back covers. Punches through up to 12 pages at a time and can combine up to 250 sheets into one comb All-in-one punching and binding in the same machine Up to 21 holes, 3x8mm in size ----- Bind pages up to 12" in length in one pass Includes adjustable margin and centering guide