Blumberg Lever Arch 2-Ring Binders for U.S. Letter Size Documents and 2 3/4" (7 cm) Center-to-Center (cc) Paper Punches (Not for A4 International Size Documents with 8 cm cc Spacing) (Blue) Lever arch metals make it easy to open and close; compressor bar secures papers, prevents tearing holes; holds 570, 20lb. sheets Big, easy to read removable labels on the spine; metal framed retrieval hole on spine Color code arch files with color binders; fully glued covers with metal reinforced bottom edges 2 rings on the 11" side; 2 3/4" center-to-center between the rings; for letter size (NOT A4) paper; posts are NOT spaced for A4 paper or for holes punched with A4 2-ring punches; be sure the holes on the paper you want to put in this binder are 2 3/4" center-to-center and not 8 cm standard European and International spacing; holes should be punched on the 11" side, NOT on the 8.5" side Dimensions: 11 5/8" H x 11 1/4" D x 2 3/4" W; buy one or more assembled binders; buy flat, unassembled binders 25 per box