Oregon 21BPX066G Micro-Chisel Saw Chain .325-Inch Pitch .058-Inch Gauge 66 Drive Link Count Advanced grind geometry enhances out-of-box sharpness and speed Bumper drive link reduces kickback without sacrificing performance Blued cutters provide superior corrosion resistance and improves strength Micro-Chisel cutter keeps cutting easy and fast Uses Lubrilink, Lubriwell, Vibe-ban, and Witness mark