MaxPower 561812X Commercial Mulching 3-Blade Set for 48 Inch Cut John Deere Replaces GX21784, GX21786, GY20852 Commercial Mulching Blades; Replaces OEM No. GX21784, GY20852 17 Inch Length; 7 Point Star Center Hole Proudly Made in the USA Fits 145 155C riders Includes 3 blades