– The recommended spark plugs for GX160 GX170 GX200 168F 170F and equivalent engines on generators, pumps, lawn mowers, scooters, etc – Thread size: M14 x 1.25mm – Thread reach: 19mm – Hexagon size: 20.8mm – Enhanced ignition efficiency – Better acceleration – Smooth running – Longer Service Life – Fast Starts – Reduced Emissions – Improved Fuel Efficiency – Stable Performance – Includes 2 spark plugs