MaxPower's 331532XB includes 1 commercial mulching blade for many 42 in. Cut MTD, Cub Cadet, Troy-Bilt mowers. Two blades are required for a 42 in. cut diameter. This blade replaces OEM #s 742-04126, 742-0616, 942-0616, 942-0616A, 942-04126, 942-04126-X, 942-04308-X, 942-0616-X, 942-0616A and Windsor 51-4440. It measures 21-3/16 in. L and 3 in. W with a 6 point star center hole. Commercial mulching blades feature greater cutting surface for increased mulching performance, sharpened cutting teeth for a precision cut, and a centrifugal air lift design for uniform chopping distribution. To ensure proper fit, please verify the OEM # of the blade you are replacing matches the OEM # listed in this description. MaxPower blades are proudly manufactured in the USA to meet or exceed OEM specification.