Hi-Lift Blade / Husqvarna 539 11 20-78Pack Size:1Husqvarna 539 11 20-78, Husqvarna 577 14 61-01Oregon 95-084, Rotary 12122Husqvarna EZ 4216, 4217, 4220, 4624, 4822, 4824, 5224, 5226; RZ4219F/R, RZ4222F, YTH series with 42" deckLength: 14 1/4 ", Center Hole: 5 pt. star, Width: 2 1/2 ", Thickness: .203 "