A&I XHT 18", 1/2", HL Mower Blade (Set of 4) - B1TR3103,4 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. Wide area walk-behind. Center Hole 1/2" Length 18" Thickness .187 Type Medium Lift Width 2-1/2" Crossed from: TOR-3405 J. THOMAS TOR3405 J. THOMAS TO18HLA MOW MORE 050575 LESCO 106-0626 TORO / WHEEL HORSE 1060626 TORO / WHEEL HORSE 22118A LANDSCAPE SUPPLY 27-0990 TORO / WHEEL HORSE 270990 TORO / WHEEL HORSE 3405 ROTARY 345-462 STENS 345462 STENS 50-2320 WINDSOR 56-2390 TORO / WHEEL HORSE 56-2390-03 TORO / WHEEL HORSE 56-2390-09 TORO / WHEEL HORSE 562390 TORO / WHEEL HORSE 56239003 TORO / WHEEL HORSE 56239009 TORO / WHEEL HORSE 7-04621 PRIME LINE 704621 PRIME LINE 92-7961-03 TORO / WHEEL HORSE 92796103 TORO / WHEEL HORSE 94-022 OREGON 94022 OREGON This is an aftermarket product, not an OEM. A physical address must be provided, NO P.O. BOXES. Thanks for looking!