Notched Air-Lift Blade / Ferris 1520842SPack Size:1Ferris 1520842, Ferris 1520842S, Ferris 5020842, Simplicity 5022808SM, Simplicity 5022808, Snapper 1-7081, Snapper 101733, Snapper 1520842, Snapper 5020842, Snapper 7017081, Snapper 7075770, Snapper 7075770YP, Snapper Pro 5020842Aladdin UFE2, Aladdin UGAT1, Aladdin UGAT7, Dealer Choice 50-4245, Green Line 34373, Green Meadow 91-209, Landscaper Express 91209, Landscaper Express 3231721, Landscaper Pro 91209, Mow More FE21, NHC BC1203, NHC EM1803, Oregon 91-209, Prime Line 7-06776, Rotary 9987, Rotary 15-9987, Sunbelt SB-90921, Sunbelt BC-1203, Sunbelt SB-2174, Sunbelt B1PD5010Ferris Requires 3 for 61" deck; Snapper Pro Requires 3 for 61" deckLength: 21 ", Center Hole: 5/8 ", Outer Hole: 3/8 ", Center To Center: 4 ", Width: 2 1/2 ", Heavy-duty, Thickness: .250 "