Universal fit quick disconnect pin that fits most of the China made PTO shafts. The overall length is 47.8mm, the larger bottom diameter is 13.6mm and it maintains that diameter for 18.5mm and then steps down to 8.4mm diameter for the next 21 mm then tapers down to 7mm diameter for the next 5mm before going back to 8.4mm at the point where it holds the spring. We sell many replacement parts for the most manufacturers rotary cutters. 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. Part Number: 52578 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.