PART NO. A-B1JD6017. BLADE-MOWER, XHT, 17", 7 LOBE. XHT (Xtreme Hardness & Toughness) blades feature a unique steel that incorporates boron, carbon, manganese, and other materials that ensure its strength. The blades are heat treated with the patented and independently tested Marbain heat-treating process. This process makes the blades 25% - 40% harder than standard lawnmower blades, making them the longest-lasting, safest, and most impact resistant lawnmower blades on the market.   (3) blades for 48" cut. Fits LA series tractors. Center Hole 7 lobe Length 17" Width 2-1/2". MODELS: John Deere (Undefined): SEVERAL (48"),John Deere RIDING MOWER: D140 (48"),John Deere RIDING MOWER: D150 (48"),John Deere RIDING MOWER: D155 (48"),John Deere RIDING MOWER: D160 (48"),John Deere RIDING MOWER: LA130 (48"),John Deere RIDING MOWER: LA140 (48"),John Deere RIDING MOWER: LA145 (48"),John Deere RIDING MOWER: LA155 (48"),John Deere RIDING MOWER: LA165 (48"),John Deere RIDING MOWER: X140 (48"),John Deere RIDING MOWER: X165 (48"),John Deere RIDING MOWER: Z245 (48"),John Deere RIDING MOWER: Z255 (48"),John Deere RIDING MOWER: 145 (48"),John Deere RIDING MOWER: 155C (48")