This is a brand new blade set for lawn mowers. Specs are as follows. (3) blades for 72 cut. Fits models XXW 2500 and XXW 4000 series. Length 24″ CH 5/8″ Width 2-1/2 Thick. This replaces part numbers: 30227-72H DIXIE 315-254 STENS 6404 ROTARY 91-507 OREGON Thanks for looking!