Item Type: Blade Balancer Material: Metal OE: 339075B 42-047 Application: Compatible with for Troy Lawn Mower Blades. It will balance any mower blade with a hole in the center. Package List 1 x Blade Balancer 1 x Adjustment Bar Please double check the part number of your item, matching information is for reference only.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. 1Application: Blade balancer is compatible with for Troy Lawn Mower Blades. It will balance any mower blade with a hole in the center. 2OE Number: 339075B 42047 are the reference part numbers. Please double check the part number of your item to ensure perfect fit. 3Precise Balancing: The blade balancer provides precise blade balancing and prevents the blade from being out of balance or bending, thus prolonging the service life of the lawn mower. 4Wall Mount Blade Balancer: Lawnmower blade balance tool is simple to install, with six magnets for better stability, providing accurate blade balance. 5Metal Construction: The blade balancer is made of high strength metal material, which is sturdy and durable, with good wear resistance.