ALFA Center stud lock knob is replacement part for Hobart meat slicers and fits in models 1612, 1712. Replaces Hobart # P-70198. Made in USA. ALFA International is a leading provider of replacement Food Prep Parts and Restaurant Equipment to the Food Service industry. Hundreds of Chain Supermarkets and Restaurants trust ALFA's products every day. High quality replacement part and food prep equipment at affordable pricing.