Item Type: Magnetic Wall Mount Blade BalancerOE: 339075B, 42 047Fitment:Replacement for Troy Mower Blades. It will balance any mower blade with a hole in the center.1Applicable 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. 2OE Number: The part number of blade balancer for reference is 339075B, 42 047, please confirm whether it is consistent with the OE you need. 3Function: Blade balancer ensures accurate blade balance, prevents imbalances or bends, and thereby enhances the lifespan of the mower, and reducing abnormal vibration during use. 4Installation 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. 5Metal Material: Magnetic wall blade balancer is made of strong metal, with 6 strong magnets for better stability, durable, with good wear resistance, corrosion resistance.1 x MagneticWallMountBladeBalancer 1 x Adjusting Lever 1 x Instructions