13-1/2 inch x 2.5mm thick JD Drill Blade WITH Raised Center for Aluminum Boot. Bearing used is BB203RR2. 2-1/2MM Thick. Fits 450, 455, 515, 520, 1520, 8100, 8200, 8250, 8300, 8350, 8500, 8550, 9400, 9450, 730, 770, 780, 1060 airseeders
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