【Replace Part Numbers】 The idler pulley replaces King Kutter part #164090 for lawn mowers, Please check the OEM, size for compatibility before you purchase 【Product Dimensions】Inner Diameter5/8" , Outer Diameter:4" , Height: 1 1/6" 【Compatible With】 RF M Series Finish Mowers, fits 4', 5' and 6' mowers with a single belt 【High quality materials】You can replace them yourself at home and bring your machines back to life in an affordable way, our products are easy to install, consistent in quality and can make your garden work easier and more efficient 【Professional】 We are a professional manufacturer, strict quality control makes us full of confidence in the products, customer satisfaction is our unremitting pursuit. If you have any questions, please contact us directly, I will give you a satisfactory answer within 24 hours 164090 Original Equipment OEM Idler Pulley Fit for King Kutter RFM Series 4', 5' and 6' Finish Lawn Mower