Rotary 6430 UPPER 6431 LOWER Honda 72511-VE2-000, 72531-VH7-000, 21" Deck Rotary replacement lawn mower blades. Fits certain Honda and Windsor lawn mowers with twin blade systems. Upper blade OEM: 72531-VE2-010, 72531-VE2-020, 72531-VH7-000, 50-2886. Lower blade OEM: 72511-VE2-000, 72511-VG4-K00, 50-2981. Two (2) blade set for 21-inch walk-behind with twin blade system.