This listing is for two replacement slip clutch disc, 160mm, 6-5/16" Diameter 3-13/16" Center Hole. Fits many slip clutch PTO shafts used by many equipment manufacturers. If your slip clutch will no longer take an adjustment, if your springs are bottomed out and your clutch still slips or your clutch is not adjustable and slipping, if your friction disc are broken or excessively worn they will need to be replaced. Most slip clutches will take 2 or 4 slip clutch disc depending on the model and torque rating of the clutch. Please check the dimensions of our clutch where the disc sit to make sure your dimensions match. Just change the quantity in the quantity to match the number of disc you need Specifications 160mm OD (6-5/16") 55.56mm ID (3-13/16")