SINGLE XHT Replacement Blade 21" MTD Cub Cadet - B1MA2417 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. (1) blade for 21" cut walk-behind. C to C 2-1/2" Center Hole 59/64 x 11/16" Length 21" Outer Hole 5/16" Thickness .125 Type Medium Lift - Notched Width 2-1/4" Crossed From: CC-742-0741 MTD/ CUB CADET/ WHITE CC-742-3032 MTD/ CUB CADET/ WHITE CC7420741 MTD/ CUB CADET/ WHITE CC7423032 MTD/ CUB CADET/ WHITE MTD6423 MOW MORE OEM-742-0641 MTD/ CUB CADET/ WHITE OEM-742-0741 MTD/ CUB CADET/ WHITE OEM-742-0741 TROY-BILT OEM7420641 MTD/ CUB CADET/ WHITE OEM7420741 MTD/ CUB CADET/ WHITE OEM7420741 TROY-BILT PR1055006 PARTNER SPM209370365 CRAFTSMAN 01002810 MTD/ CUB CADET/ WHITE 082561 LESCO 1002810 MTD/ CUB CADET/ WHITE 198-049 OREGON 198049 OREGON 269480 HOME DEPOT 335-214 STENS 335214 STENS 4415249 A & I MEGA-CROSS 4441232 A & I MEGA-CROSS 4452178 A & I MEGA-CROSS 490-100-C089 MTD/ CUB CADET/ WHITE 490-100-M084 MTD/ CUB CADET/ WHITE 490-100-M084 TROY-BILT 490-100-M086 ARNOLD 490100C089 MTD/ CUB CADET/ WHITE 490100M084 MTD/ CUB CADET/ WHITE 490100M084 TROY-BILT 490100M086 ARNOLD 6273 ROTARY 6423 ROTARY 7-06711 PRIME LINE 702810 LESCO 706711 PRIME LINE 742-04276 MTD/ CUB CADET/ WHITE 742-04276S MTD/ CUB CADET/ WHITE 742-04380 MTD/ CUB CADET/ WHITE 742-04380-0684 MTD/ CUB CADET/ WHITE 742-0741 MTD/ CUB CADET/ WHITE 742-0741 TROY-BILT 742-0741-S MTD/ CUB CADET/ WHITE 742-0741-X MTD/ CUB CADET/ WHITE 742-0741A MTD/ CUB CADET/ WHITE 742-0741A TROY-BILT 74204276 MTD/ CUB CADET/ WHITE 74204380 MTD/ CUB CADET/ WHITE 742043800684 MTD/ CUB CADET/ WHITE A physical address must be provided NO PO BOXES. This is an Aftermarket part. Thanks for looking!