The Toro OEM 133 2163 Recycler Mower Deck Blade boasts high-quality cutting performance and exceptional durability. It features specialized "accelerator" wings that effectively push grass clippings back into the ground, resulting in a healthier lawn. This Mower Deck Blade was made to OEM Specifications to fit Toro ZMaster 2000 series (EXCEPTION OF MODEL 74141) and the Titan HD series with a 48 in. Deck. Please Refer to the Special Notes, References and The Model Fit Chart below to ensure a proper fit. Click on the Part Numbers to be redirected. Toro Recycler or Mulching blades do require the use of a recycler kit in order to function at their full capability. NOTE: Due to a Serial Number brake that could overlap Models, The Toro 133-2163 does require the External Square Shaft/Blade Arbor with slightly rounded corners. The External Square Shaft/Blade Arbor with slightly rounded corners is used by the Titan HD, and Z Master 2000 series. If you have a Z Master 2000 with a Model Number 74141 or a Titan series with a Round Shaft/Blade Arbor refer to part number 117-7278-03. Click on the part numbers to view associated parts. Refer to the image above for an accurate Comparision. COMPATIBLE BLADE REFERENCES 133-2137 - Hi Flo Blade 133-2160 - Atomic Blade 117-7278-03 - Mulching/Recycler Blade, (Model 74141, 2000 series Z Master) COMPATIBLE RECYCLER KIT 126-8701 - Z Master 2000, Titan HD 1500 and 2000 series (Except Titan HD Model 74470 and Z Master 2000 Model 74141). 133-2168 - Titan 2500 HD Model 74470 120-2401 - Z Master 2000 Model 74141 COMPATIBLE COMMON SPINDLE ASSEMBLY PART REFERENCES 139-2357 - Spindle Assembly (Click on part number to view associated parts) Specification Product Number: 1332163 Brand: Toro Length: 16.250 IN (41.275 CM) Width: 2.500 IN (6.350 CM) Height: 1.250 IN (3.175 CM) Weight: 2.172 LB (0.985 KG) Model Fit: 78450, 74450, 74460, 74470, 74465, 74453, 74490, 74495, 77248, 77280, 77281