From Wahl Professional?s commercial grade line of products, our Premium Black Cutting Guides were designed for professional use only with Wahl Professional full-sized clippers (excluding detachable blade clippers). These secure-fitting durable metal clips come in a range of sizes for precision fades and dependable lengths, including 1/8?, ¼?, 3/8?, ½?, 5/8?, ¾?, 7/8?, and 1?. With the exception of Wahl?s competition series blades (and detachable blades), our Premium Cutting Guides will fit all full-size clipper blades for maximum versatility. Package includes (8) Premium Black Cutting Guides (#3171-500) - 1/8?, ¼?, 3/8?, ½?, 5/8?, ¾?, 7/8?, and 1? comb tray. Clipper not included. Leo J. Wahl invented the first hand-held electric clipper back in 1919. He believed in necessary, reasonably priced products that enhanced the lives of everyone who used them. Today, all Wahl products embrace the principles of our founder. We offer reliable, value-priced devices and solutions that protect skin and hair while performing on all skin and hair types.