This listing is for one replacement friction disc for Sidewinder PTO Slip Clutches. These friction disc have and outside dimension of 150mm or 5.91" and an inside dimension of 91mm or 3.58". Depending on the application two or four of these disc are used, simply increase the quantity to purchase to meet your needs. Please measure your old clutch to ensure fitment before purchasing this item. Specifcations: OD: 150mm or 5.91" ID: 91mm or 3.58" Replaces: 27683SW We sell many replacement rotary cutter parts. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.