1 NEW BLADE ADAPTERFITS AYP: 532193825, 532850977, 581547901, 850977, 851514FITS CRAFTSMAN: 193825OLD PART NUMBERS: 851514 OR 850977 NOW CHANGES TO 193825FITS HUSQVARNA: 532193825, 532850977, 532851514, 581547901FITS AFTERMARKET: 405-435, 8753, 65-007, 850977, B1SB8275FITS MODELS: 1B101C, 3H302C, 2A271D AND 2033A59. FOR 20" & 22" WALK BEHIND MOWERS. OUTER DIAMETER: 7/8"INNER DIAMETER: 7/8" Warning: Lead-Nickel-Cancer and Reproductive Harm