2.25 in. Heavy Duty Hook Blade for Carpet Knives, Trimmers and Cutters (10-Pack) Blades measure 1.84" long x .025" thick 10 Blades per pack Fits Roberts 10-905 Multipurpose Wall Trimmer Fits Roberts 10-920-6 Utility Knife Fits Roberts 10-218 "Big Fatso" Knife