Blade Adapter / AYP 850977Pack Size:1AYP 850977, Husqvarna 532 85 09-77Foley/Belsaw 5980160, Green Meadow CA991, Laser L1998, Laser 97492, NHC 217-1235, Oregon 65-006, Ratio Parts 22-752, Rotary 8752, Sunbelt SB-8752, Sunbelt B1SB8752AYP 20" walk behinds 1994 and newer; Husqvarna 20" walk behinds 1994 and newer ID: 7/8", 1 7/8" for outer pins from center to center