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Oregon's 21-inch mower blade, part number 91-071, is made to exact OEM specifications for optimum performance. Three blades are required for a 60-inch or 61-inch cut. Can be used as an alternative to Bush Hog part numbers 50029159, 50034299, 50055707, 50056493, 82324, 823242, 823243, 95754. Can be used on select Bush Hog models including: (CZ) Commercial, (CZ) Commercial Series, (EC) Estate Commercial, (HS) Home Series, (PZ) Professional, (PZ) Professional Series, CZ2561, EFM600, ERM, FE21B, FTH, FTH600, FTH720, M2254, M2254K, M2255, M2260, M2261, M2354, M2355, M2360, M2361, M2554, M2555, M2560, M2560K, M2561, M2561K, M2661, M2672, M2673, M2761, MTH-600, MTH-720, PRO52, PRO61, PZ2761KH3, PZ3061KH3, RDTH, RDTH 60, RFM 60, TD-1500, TD-1700, TH, TH48, TH60, TH72, ZT-18 18HP, ZT-180 18HP, ZT-22 22HP, ZT-220 22HP, ZT-220W 22HP, ZT-22W 22HP, ZT-230 30HP, ZT-25 25HP, ZT-250 25HP, ZT-30D 30HP.