1. Support and protection: Support bearings to reduce wear and prevent pollution. 2. Adjustment and fixation: Adjust the bearing clearance and fix the bearing position. 3. Enhanced performance: Improve bearing rigidity and accuracy to ensure mechanical system stability. These functions together ensure the normal operation and efficient performance of the lawn mower. Durable material Light weight and durability This is High quality of Metal material Very compatible with for Stihl FS38, FS45 Condition:100% New Type:Bearing Housing Part Number:41446405900 4144-640-5900 4144 640 5900 Fitment: For Stihl FS38, FS45 Trimmer, 4144 640 5900 weedeater Parts, Bearing Housing:For FS36,FS40,FS44,FS46,FS40,FS50,FSE60.FSE71.FSE81. Colour:As Shown Material:Metal Package Contents: 1 x Bearing Housing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.