Mulching Blade / MTD 942-0721Pack Size:1MTD 742-0563, MTD 742-0721, MTD 942-0721Aladdin UMT44, Dealer Choice 50-3120, Edgewater 155544, ESF 114-701, Foley/Belsaw 5980018, Foley/PLP 114-701, Green Line 156139, Green Meadow UMT63, Kwik-Fix 814229, Laser L2034, Laser 91428, Laser 91480, NHC MA2409, Oregon 98-007, Prime Line 7-04785, Ratio Parts 22-328, Rotary 6139, Rotary 15-6139, Sunbelt SB-98915, Sunbelt MA-2409, Sunbelt SB-6139, Sunbelt B1MA2409MTD 21" walk behind mulching mowerLength: 21 ", Center Hole: 13/16 ", Outer Hole: 3/8 ", Center To Center: 2 1/2 ", Width: 2 1/4 ", Thickness: .134 "