Husqvarna 532173921 Replacement Mulching Blade For Husqvarna/Poulan/Roper/Craftsman/Weed Eater Length: 16-5/8-inch, Center Hole DIAM: 5 point star, Width: 2-1/2-inch Current part number 532173921 replaces previous part number 173921. Replacement part for many brands including Husqvarna, Poulan, Poulan Pro, Roper, Sears/Craftsman, and Weed Eater Original equipment manufacturer replacement part 1-year warranty for defects in material or workmanship