SIZE: Please measure your stove knob before purchase, otherwise it cannot be used. SCIENTIFIC AND SAFETY DESIGN: Parents can open the buckles easily, but it's difficult for kids, it helps prevent accidents before they happen. WHY NEED IT: Prevent children from opening the stove and hurting themselves (for example, burning themselves or causing fire or poison), prevent babies from pulling the throttle and losing them. It can also be used on oven knobs. MATERIAL: High temperature resistant PC+ABS material ensures product quality and service life. UNIVERSAL SIZE: Our products are applicable for most gas stove knobs. White color Size: Inner circle diameter 1.9cm The diameter of the inner wall of the outer circle is 5.9cm Thickness of the base 0.16cm Transparent cover height 3cm Quantity delivered: 4 pieces Product dimensions are all measured by hand, there are errors and the actual product shall prevail. Product color is affected by shooting light view and there is a slight color difference, which depends on the actual product received.