[Replacement Part Number]Blade Balancer Replacement Part Number: 339075B, 42-047. [Accessories]This blade balancer is made of high-quality material and has 6 magnets to a perfect grip for better stability and durability. It can accommodate any size blade center hole up to 1-1/2inch. The balancer has a ball bearing spindle. Mounted . [Product Function]: Lawn mower blade set. The blade balancer detects blade balance and then sharpens the blade with the blade sharpener. The product is perfectly matched, a new sharpening , and improves the efficiency of sharpening work. [Easy to operate]: Quick installation, mounting bracket. After installing the tool, it only takes seconds to test the lawn mower blade and sharpen the work. Colour:Red Material:Iron+Aluminum Package Contents: 1x Balancer 1x Nut sleeve 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.