1.We recommend that the installation work be carried out by professional technicians. 2.Compatibility: Suitable for 2500, 3800, 4500, 5200, 5800, MS170/MS180, MS230/MS250, MS380/MS381, MS660, MS070, 137/142, 365/372, 268/272, PT350/360, TU26, 34F, 36F, 40F5, 44F5 and other engines, widely adapted. 3.Content: Each package contains 1 L7RTC model, providing a reliable ignition solution. 4.Thread specifications: Meet the needs of common engines, easy to install and replace. 5.Ceramic: Ceramic is heatresistant and wearresistant to ensure a stable ignition effect. 6.Wide applicability: Suitable for a variety of models, widely used in garden tools, chainsaws and others, to ensure a smooth start. 7.Performance improvement: Regularly replacing plugs can maintain the ignition condition of the engine and ensure that it continues to function effectively. 8.Easy installation: Users can install quickly, save maintenance time, and improve work efficiency. 9.Manual measurement of weight indication, with slight deviation.