Screw U6S-Unf 1/4X28 - 5065578-01 Spare part for Husqvarna Lawn Mower/Rider from the Husqvarna spare parts catalog Suitable for (among other models): Rider 111B5 Rider 112C5 Rider 11 Rider 11 Bio Rider 11C Rider 11R Rider 850