A&I XHT 16-1/4", 5/8" Mulching Mower Blade (Set of 6) - B1EM1815,6 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. (3) Blades for 48" cut. Center Hole 5/8" Length 16-1/4" Thickness .165 Type Medium Lift Width 2-1/2" Crossed From: BO-175 J. THOMAS BO175 J. THOMAS EX16B MOW MORE E323515 TORO / WHEEL HORSE 1-323515 EXMARK 1-323515 TORO / WHEEL HORSE 1-403059 EXMARK 1-403086 EXMARK 1-403148 EXMARK 1-413438 EXMARK 103-1577 EXMARK 103-1577-S EXMARK 103-2517 EXMARK 103-6336 EXMARK 103-6336-S EXMARK 103-6581 EXMARK 103-6581-S EXMARK 103-6583-S EXMARK 103-6738 EXMARK 103-6738-S EXMARK 1031577 EXMARK 1031577S EXMARK 1032517 EXMARK 1036336 EXMARK 1036336S EXMARK 1036581 EXMARK 1036581S EXMARK 1036583S EXMARK 1036738 EXMARK 1036738S EXMARK 116-5178 EXMARK 116-5178-S EXMARK 1165178 EXMARK 1165178S EXMARK 1323515 EXMARK 1323515 TORO / WHEEL HORSE 1403059 EXMARK 1403086 EXMARK 1403148 EXMARK 1413438 EXMARK 355-028 STENS 355028 STENS 403086 EXMARK 403148 EXMARK 413438 EXMARK 50-1825 WINDSOR 501825 WINDSOR 6175 ROTARY 7-06342 PRIME LINE 706342 PRIME LINE 90-417 OREGON 90417 OREGON 91-194 OREGON 91-368 OREGON 91194 LANDSCAPE SUPPLY 91194 OREGON 91368 OREGON 9988 ROTARY This is an aftermarket product, not an OEM. A physical address must be provided, NO P.O. BOXES. Thanks for looking!