Premium Quality Material: Crafted from durable manganese steel, these lawn mower blades are designed to withstand the rigors of regular lawn maintenance, ensuring long-lasting performance and reliability. Wide Compatibility: These replacement blades are compatible with a range of popular lawn mower models, including Cub Cadet CC439, CC949, MTD RM105, and more. They are specifically tailored for walk-behind mowers with a 21" deck size, offering a versatile solution for various machines. Precise Specifications: Measuring 21" in length, 2-1/8" in width, and .126" in thickness, these blades feature a bowtie center hole design for easy installation. The meticulous attention to detail ensures a perfect fit and optimal cutting efficiency. Enhanced Performance: Engineered to deliver exceptional cutting results, these blades boast an outside diameter of 5/16" and precise center-to-center outside hole measurements. Whether tackling thick grass or light vegetation, these accessories help maintain a well-manicured lawn with ease. Reliable Replacements: With compatibility extending to Tru Cut 100, Tuff Cut 220, Pro Cut 310, and more models, these blades serve as reliable replacements Description: Enhance the performance of your lawn mower with these durable and reliable lawn mower blades. Compatible with a wide range of models including junior students CC439, CC949, CC989, CC997ES, PR521, S621SS, SC621, SC621E, SRC621, SRE621, SRS621, CC469, CC46M, CC46MZ, CC98M, CC997 ES, S621, SR621, 5521, CC46ES, CC94M, CC98 H, and MTD RM105, RM110, RM120, RM210, RM220 walk behind lawn mowers featuring a 21" mower deck. Crafted to precision, these blades boast specifications of 21" in length, 2-1/8" in width, and a thickness of .126". The center hole is designed in a bowtie shape, ensuring a secure fit. With an outside diameter of 5/16" and a center-to-center outside hole distance of -1/2", these blades are engineered for optimal cutting performance. Item Name: Lawn Mower Blade Material: Manganese Steel Applicable Fields: Animal Husbandry, Breeding, Forestry, Agriculture, Fishery Center Hole: Bow Tie Features: Sturdy Manganese Steel, Wide Compatibility, Replacement Blade Size Details: Length: 21" (Approx.) Width: 2-1/8" (Approx.) Thickness: 126" (Approx.) Deck Size: 21" (Approx.) Outside Diameter: 5/16" (Approx.) Center to Center Outer Hole: -1/2" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Lawn Mower Accessories