Husqvarna 581650901 Lawn Mower Blade Adapter Genuine Original Equipment Manufacturer (OEM) Part This part is compatible with models including; 917374890,96145001901,917372750,917375920,917370891,917375921,917370890,917375922,HU725AWDH-96145001901,917370892,917372751,917375923,917384591,917384590 Blade adapter 581650901 attaches the mower blade to the motor shaft Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Craftsman,Husqvarna This blade adapter (part number 581650901) is for lawn mowers Disconnect the spark plug wire before installing this part