Includes (1) 581643603 Cutting Chain. New, retail packaged. Please consult owners manual for proper fit and identication. SP33G is a standard sequence, semi-chisel cutter, and round ground chain that can be sharpened with 3/16" files. This low kickback chain has 72 drive links and is compatible with 18" bars. The chain is especially suited for demanding consumers and everyday professional use. The .325" pixel pitch and .050" gauge (Narrow Kerf) chain provides a narrow cut, low weight, and enhanced cutting efficiency. Compatible with the Following: 435, 440, 445, 450, 450 Rancher