XHT 17-1/2", 2-1/4" Mower Blade (Set of 6) - B1TR3116,6 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 50" cut High Lift. Center Hole 5/8" Length 17-1/2" Replaces Toro: 110-6837-03 Thickness .165" Type High Lift Width 2-1/4" Crossed From: 110-6837-03 TORO / WHEEL HORSE 110683703 TORO / WHEEL HORSE 112-9759 TORO / WHEEL HORSE 112-9759-03 TORO / WHEEL HORSE 1129759 TORO / WHEEL HORSE 112975903 TORO / WHEEL HORSE 115-5059 TORO / WHEEL HORSE 115-5059-03 TORO / WHEEL HORSE 115-5089 TORO / WHEEL HORSE 1155059 TORO / WHEEL HORSE 115505903 TORO / WHEEL HORSE 1155089 TORO / WHEEL HORSE 12273 ROTARY 350-223 STENS 350223 STENS 94-059 OREGON 94059 OREGON A physical address must be provided, NO PO BOXES. Thanks for looking!