1 NEW BLADE ADAPTER FITS AYP: 532193825, 532850977, 581547901, 850977, 851514 FITS CRAFTSMAN: 193825 OLD PART NUMBERS: 851514 OR 850977 NOW CHANGES TO 193825 FITS HUSQVARNA: 532193825, 532850977, 532851514, 581547901 FITS AFTERMARKET: 405-435, 8753, 65-006, 850977, B1SB8275 FITS MODELS: 1B101C, 3H302C, 2A271D AND 2033A59. FOR 20" & 22" WALK BEHIND MOWERS.    OUTER DIAMETER: 1-3/8"INNER DIAMETER: 7/8" Warning: Lead-Nickel-Cancer and Reproductive Harm