A&I XHT 16-1/4", 2-1/2" Blade (Set of 2) - B1EM1887,2 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. Center Hole: 15/16" Length: 16-1/4" Replaces Exmark: 103-6381 Thickness: .197" Type: Medium Lift Width: 2-1/2" Fits the following Models: Exmark WALK-BEHIND MOWER: METRO HP Exmark WALK-BEHIND MOWER: TURF TRACER HP Exmark ZERO-TURN: LAZER Z Exmark ZERO-TURN: LAZER Z ADVANTAGE X Exmark ZERO-TURN: LAZER Z AS Exmark ZERO-TURN: LAZER Z CT Exmark ZERO-TURN: LAZER Z HP Exmark ZERO-TURN: QUEST This is an aftermarket product, not an OEM. Thanks for looking!