Oregon 571037 PowerSharp Replacement Saw Chain Kit for CS1500 with Onboard PowerSharp System, 18" Fits OREGON CS1500 Electric Chain Saw Top-sharpening design allows the cutters to be sharpened in seconds on the saw. Pull the PowerSharp lever on the PowerNow chainsaw for 3-5 seconds 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 The Oregon PowerNow 571037 Replacement Saw Chain, PowerSharp 18-in (includes sharpening stone) is low-kickback per ANSI B175.1 & CSA Z62.3 Top-sharpening design allows the cutters to be sharpened in seconds on the saw. Pull the PowerSharp lever on the PowerNow chainsaw for 3-5 seconds 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 The Oregon PowerNow 571037 Replacement Saw Chain, PowerSharp 18-in (includes sharpening stone) is low-kickback per ANSI B175.1 & CSA Z62.3