Goplus 21-Hole 250 Sheets Paper Comb Punch Binder Binding Machine Scrapbook w/200 Combs It is safe and efficient to use at home or office. This is a good helper to punch and bind up reports, files, essay papers efficiently. Product Dimension:14.6'' X 8.9'' X 6.3'', Weight: 14.3 Lbs. Blinding Capacity:250 Sheets(25mm Ring), Punching Capacity:12 Sheets(80g). Max Paper Size:A4, Margin Adjustable Range:2.5/4.5/6.5mm, Number Ofholes:21 Holes 3 X 8mm Rectangle.