STIHL 26RMC3-68 Oilomatic Rapid Micro Comfort 18-Inch Saw Chain, .325-Inch Pitch, .063-Inch Gauge, 68 Drive Lengths 0.325-Inch rapid micro chain 68 Drive lengths Is the reduced kickback, for less risk Lower vibration levels to help reduce operator fatigue Special cutter shape that reduces cutting friction to a minimum, ensuring fast cutting speed with good efficiency in any type of wood