MaxPower's 331730B includes 1 commercial mulching blade for many 20 in. Craftsman, Husqvarna, and Poulan mowers. This blade replaces OEM #s 145106, 532145106, 752233, 531307212 and PP22055. It measures 20 in. L and 2-1/4 in. W with a 5/8 in. 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 to meet or exceed OEM specification.