A&I XHT 18", 5/8", Notch Mower Blade (Single) - B1EM1802,1 Replacement XHT Lawnmower blade. XHT(Xtreme Hardness & Toughness) blades are 25-40% harder than standard lawnmower blades. Benefits of the HXT blade are sharper and longer lasting cutting edges. More resistance to bending. Tighter tolerances in the aftermarket vs. OEM. XHT blades also offer greater impact toughness. (2) blades for 36" cut. (3) blades for 52" cut. Center Hole 5/8" Length 18" Thickness .197 Type Medium Lift - Notched Width 2-1/2" Crossed From: 1-303146 EXMARK 1-303283 EXMARK 1-633482 EXMARK 103-6584 EXMARK 103-6584-S EXMARK 1032528 EXMARK 1036584 EXMARK 1036584S EXMARK 310-011 STENS 310-052 STENS 310-094 STENS 310-110 STENS 310-508 STENS 310011 STENS 310052 STENS 310094 STENS 310110 STENS 310508 STENS 50-2215 WINDSOR 50-2295 WINDSOR 50-4215 WINDSOR 502215 WINDSOR 502295 WINDSOR 504215 WINDSOR 7-04768 PRIME LINE 7-04960 PRIME LINE 7-06388 PRIME LINE 7-06425 PRIME LINE 704764 PRIME LINE 704768 PRIME LINE 704960 PRIME LINE 706388 PRIME LINE 706425 PRIME LINE 91-184 OREGON 91-188 OREGON 91-312 OREGON 91184 OREGON 91188 OREGON 91312 OREGON 7075751BZ YAZOO/ KEES 7075751BZYP YAZOO/ KEES 77344 YAZOO/ KEES 7-7344 YAZOO/ KEES A-6250 ROTARY 2173 ROTARY 112111-02 BOBCAT 11211102 BOBCAT 32022A BOBCAT This is an aftermarket product, not an OEM. A physical address must be provided, NO P.O. BOXES. Thanks for looking!