This Estella belt is a direct replacement for the one that came standard on your Estella SL series meat slicer. It is compatible with SLM12, SLM13, SLA13, and SLA13S meat slicers. The belt in your unit ensures that you can smoothly slide meats into the blade. If your original belt is worn out or broken, replace it promptly to ensure proper operation of your meat slicer.