Secret Hidden Belt Knife Fits Up To 44 Inch Waist. This innovative idea combines a regular belt with a hidden knife! Master Cutlery M3545- this concept could ensure you have the upper hand in any dangerous situations. Black, sleek and tough, keep this close to hand at all times. The belt will accommodate waist sizes up to 44 inches. It is made using a Black Nylon web that is tough and agile. The main point with this belt is of course the knife. The buckle at the front is a 3 1/2 inch solid stainless steel Black colored belt buckle that doubles up as the knife handle. Simply pull on the buckle to reveal a 3 3/8 inch Black finished partially-serrated knife blade. The blade will happily deal with all manner of tasks from cutting through to slicing. There is even a notched section on the upper spine where you can place your thumb during use and gain additional strength and control during use. The M3545 belt knife has to be one of the best kept secrets. We think so anyway!