Feature: 1. Applicable Model: Blade balancer is replacement for Troy Mower Blades. It will balance any mower blade with a hole in the center, please confirm your model before buying. 2. OE Number: The part number of blade balancer for reference is 339075B, 42 047, please confirm whether it is consistent with the OE you need. 3. Function: Blade balancer ensures accurate blade balance, prevents imbalances or bends, and thereby enhances the lifespan of the mower, and reducing abnormal vibration during use. 4. Installation Note: When installing the balancer, please make sure there is enough space on both sides so that the blade can rotate 360 degrees without being obstructed or touching anything. 5. Metal Material: Magnetic wall blade balancer is made of strong metal, with 6 strong magnets for better stability, durable, with good wear resistance, corrosion resistance. Specification: Item Type: Magnetic Wall Mount Blade BalancerOE: 339075B, 42 047 Fitment:Replacement for Troy Mower Blades. It will balance any mower blade with a hole in the center.. Package List: 1 x Magnetic Wall Mount Blade Balancer1 x Adjusting Lever 1 x Instructions Note: Please double check the part number and fitment of your item, matching information is for reference only.