Part Number: 3705938001. Backorder: No ETA. $17.84 Add to Cart. This is a 21-Inch OEM blade for your lawn mower. Sold individually. The blade should be regularly inspected for damage, such as bending, cracking and wear. To ensure the best and safest performance from your blade, it needs to be kept sharp and clean. Aftermarket Mower Blades. We've our have sales staff, style and design staff, technical crew, QC team and package workforce. We've strict excellent control procedures for each system. Also, all of our workers are experienced in printing field for Aftermarket Mower Blades, Lawn Dethatcher Blade, Walker Lawn Mower Blades, Grasshopper Lawn Mower.