Features 1. Application: Blade balancer is compatible with Troy lawn mower blades. It will balance any mower blade with a hole in the center. 2. OE Number: 339075B 42-047 are reference part numbers. Please double check the part number of your item to ensure proper fit. 3. Precise Balancing: The blade balancer provides accurate blade balancing and helps prevent imbalance or blade bending, extending the service life of the lawn mower. 4. Wall Mount Blade Balancer: Lawn mower blade balancing tool is easy to install, with six magnets for enhanced stability, delivering reliable balance results. 5. Metal Construction: The blade balancer is constructed from high-strength metal material, offering durability and wear resistance. Specification Item Type: Blade Balancer Material: Metal OE Number: 339075B 42-047 Application: Compatible with Troy lawn mower blades. Balances any mower blade with a center hole. Package List 1 x Blade Balancer 1 x Adjustment Bar