MaxPower 561735X Commercial Mulching 3-Blade Set for 48"Cut Poulan/Husqvarna/Craftsman Replaces 173921, 532173921 Commercial Mulching Blades Replaces OEM No. 173921, 173920, 180054 16-5/8 Inch Length; 5 Point Star Center Hole Proudly Made in the USA Includes 3 blades