Fit model: This Single Replacement Foil and Cutter compatible with Andis #17150 Pro foil shaver.When the foil and cutter are dull, you can change it HIGHER QUALITY:Replacement Shaving Head & Cutter Blades with Hypo-Allergenic Silver Foil Head with Bump Prevent Technology. Item length: 1.38 inch How to use: the replacement package includes a hypo-allergenic gold foil and a gold cutter bar assembly,Designed to get the closest shave possible without being painful or irritating CUSTOMER ARE OUR PRIORITY: If you can't install it, you can refer to the instructions on the back of the package or contact us in timewe will solve it for you within 24 hours