Housweety 200 Silver Tone Book Scrapbooking Album Menu Folder Corner Protectors Alloy(Cadmium Free) size:21mm x 15mm( 7/8"x 5/8")Thickness:3mm( 1/8") It fit 3mm( 2/8") thickness book Environmental protection,light weight,convenient installation Can be used with a variety of Book Scrapbooking