The Oregon 571037 Replacement Saw Chain, PowerSharp 18 in. is a low profile chain with a 3/8 in. pitch and 0.050 in. (1.3 mm) gauge chain, and includes a sharpening stone designed specifically for the Oregon CS1500 chainsaw. The 571037 Replacement Saw Chain (and sharpening stone) features top-sharpening cutters with depth gauge tie straps and guidance drive links for low-kickback performance, good chip flow, and smooth cutting action. The top-sharpening design allows the cutters to be sharpened on the saw, on the job, in seconds. The chisel-style cutters deliver efficient cutting and excellent stay-sharp. Ramped depth gauges and ramped guidance drive links deliver smooth cutting action and low-kickback performance. Meets low-kickback standards per ANSI B175.1 and CSA Z62.3. (Important: Designed to be used only with the Oregon PowerNow chainsaw).