Specification Length: 20-1/2" Width: 2-1/2" Thickness: 0.240" Center Hole: 5/8" Air Lift: 29/32" Cutting Edge Length: 7-1/16" Deck: 60" How to install You would need a wrench to replace it. 1. Make sure to disconnect spark plug before beginning repair 2. Lift the deck to the highest position 3. Remove flange nut that holds old blade 4. Replace old blade with a new one 5. Reassemble and test the mower