Universal 3-in-1 Blade / 21" L, Bow Tie Center HolePack Size:1Craftsman 33402, Partner PR1055003Home Depot 181166, Lowe's 78029, NHC 213-3040, Outdoor Factory Parts 430141, Oregon 90-511Universal most 21" decksLength: 21 ", Center Hole: Bow tie, Outer Hole: 3/8 " X 1 1/2", Center To Center: 3 ", Width: 2 1/4 ", Includes 3/8" washer, 7/16" washer and cupped serrated washer, Thickness: .149 "