Stanley Hooked Knife Blades - Pack of 10 These sharpened, hooked blades make it easy to cut sheet materials from rolls, such as flooring, roofing and plastic coverings. They fit most Stanley knives. Under the Criminal Justice Act 1988 age restrictions apply to the sale of knives: no persons under the age of 18 can purchase knives. Please be aware Robert Dyas will verify your age before dispatching your order.