1Part Number: Replace 7810748 78107480637 40009 981 074849 105 M017. Instead for Troy Bilt TB554, you can choose by model. 2Heavy Steel Material: The blade is made of high carbon steel and is resistant to bending, breaking and breakage. The blade is heat treated to make it more durable and last longer. 3Blade Size: Center hole: 5/8in., length is 9.0 in., width is 9.0 in., to meet your requirements in different scenarios, to provide guarantee for your normal use. 4Purpose: This blade is used for edges. It is fixed to the drive shaft for cutting. Both sides of the blade are the same, so you can select either side of the blade for installation. 5Blades Support the Following Models: For Troy Bilt, for MTD, for MTD Gold, for Yard Man, for Huskee, for Yard Machines, and for Bolens units. Item Type: 3 Side Edger Star Blade Weight: 368g/13oz Product Size: 22.9 x 22.9cm/9 x 9in Aperture: 5/8in Part Number: Replace 7810748 78107480637 40009 981 0748490 105 M017. Replacing for Troy Bilt TB554. Blades Support the Following Models: For Troy Bilt, for MTD, for MTD Gold, for Yard Man, for Huskee, for Yard Machines, and for Bolens units. Material: 65 manganese steel 1 x Trimmer Blade