3 Needed on 54" decks Fits: D170 G100 G110 LA150 LA175 190C Made in the USA! Commercial Mulching Blades Hands down the ABSOLUTE best aftermarket replacement blade on the market! Don't waste your money on the cheapest set you can find on eBay unless you want a cheap blade that will not perform! This sale is for 3 replacement XHT blades. Compatible with John Deere GX21380 GY20679 GY20684 GY20686 3 needed on 54" decks Center Hole: 7 "LOBE Width: 2-1/2" Length: 18-5/8" Thickness: .250" Fits these models with 54" deck D170 G100 G110 LA150 LA175 190C