Medium-Lift Blade Thickness: .187 ", Width: 2 3/4 ", Length: 18 5/8 ", Center Hole: 7 pt. star, Packaging Type: Branded label, Specially designed: to replace 7 pt. star center hole. Replaces Part Numbers: John Deere GX21380, John Deere GY20684, John Deere GY20679, Craftsman SPM684375001, John Deere GY20686. Stens Part Number: 330-704