Medium-Lift Blade / John Deere GY20684Pack Size:1Craftsman SPM684375001, John Deere GX21380, John Deere GY20684, John Deere GY20679Home Depot 168689, Lowe's 311958, NHC 212-0385, NHC JD6019, Outdoor Factory Parts 578431907, Oregon 92-103, Oregon 92-617, Rotary 11491, Stens 330-449, Sunbelt B1JD6019John Deere D170, G110, 190C and LA150; requires 3 for 54" deckLength: 18 5/8 ", Center Hole: 7 pt. star, Width: 2 3/4 ", Thickness: .187 "