Use the De Buyer Double Julienne Blade with your La Mandoline Ultra to create 2 varieties of thickness. The thick blade (10 mm) creates perfect shoestring French fry shapes. The thin blade (4 mm) creates long, thin cuts, perfect for slicing carrots to add to coleslaw. Each side features extremely sharp stainless steel blades. Fits the De Buyer La Mandoline Ultra and the La Mandoline Swing Pro.