1. [Easy to Use for Adults] The new unlocking method with a improved safety factor makes it hard for babies to figure out and open, but easy for adults to open/close the device with one hand. Prevent kids from turning on stoves and ovens, which could cause fires or release harmful gases. 2. [Universal Size] In order to fully cover more different shapes and sizes of gas stove knobs, the size has been upgraded to fit gas stove and oven knobs with an inner diameter of less than 2.4 inches. 3. [High Temperature Resistant & Clear View] Made of hard PC material, high temperature resistant, can ensure the quality and longevity of the gas stove knob covers. And the ultra-clear stove safety knob covers will not block the view of the temperature control mark when closed. 4. [Child Safety Kit - Easy to Install] The pack contains 5 childproof stove knob covers & 1 oven lock child safety. It comes with 5 pieces of strong adhesive, you can choose to use the adhesive to fix the gas knob protectors covers to the stove to prevent the cover from turning. It will not cause any damage to the surface of the stove and the adhesive pads can be easily removed without residue. 5. [Application Range] Please measure the stove knob before purchase, otherwise it may can not be used. The distance from center of one knob to center of next knob should be 3"(≥76mm) or more. The height of gas knob should less than 1.9"(≤48mm). The diameter of gas knob should less than 2.4"(≤61mm).