Three (3) New Aftermarket Replacement Mulching Lawnmower Blades Fits Husqvarna, & AYP Compact Tractor Models: Consumer Z Series Models, YTH1542XPG, YTH1542XP, & Other Lawn Tractors with 42″ Mower Decks.Two (2) Blades are Needed for a 42″ Cut!Tech Info:- Center Hole: 5 Point Star- Length: 21″- Thickness: 0.134″- Width: 2-1/4″XHT(Xtreme Hardness & Toughness) blades are 25-40% harder than standard lawnmower blades. Bene Fits of the XHT blade are sharper and longer lasting cutting edges. More resistance to bending. They also offer Greater Impact Toughness.Replaces Part Number: 133288-Mulch, 139775-Mulch, 95-005