Hi-Lift Blade / MTD 942-0621Pack Size:1MTD 742-0621, MTD 742-0521, MTD 942-0621, MTD 742-0306, MTD 742-0490Aladdin UMT50, Dealer Choice 50-2740, Dealer Choice 50-2885, Edgewater 155547, Edgewater 155552, Foley/Belsaw 5980017, Green Meadow UMT53, Green Meadow UMT68, Kwik-Fix 814181, Laser L1422, Laser 91011, Laser 91154, NHC MA2428, Oregon 98-521, Oregon 98-002, Prime Line 7-04738, Quality 120763, Rotary 6096, Rotary 15-6096, Sunbelt SB-98521, Sunbelt SB-98002, Sunbelt B1-MA2428, Sunbelt B1MA2428MTD 400 series, 21" walk behind; White 400 series, 21" walk behindLength: 21 ", Center Hole: 7/8 ", Outer Hole: 3/8 ", Center To Center: 2 1/2 ", Width: 2 1/4 ", Thickness: .134 "