A: The Stove Knob Covers do snap open and closed with a tab on the side. The covers can keep someone for accidentally turning the stove knobs, but someone with enough dexterity will be able to open the covers.
A: The covers are only designed to fit a stove knob up to 2-5/8" in diameter and 1-3/4" high. The knob needs to be removable to properly install the covers. Depending on the model and style of dial, the covers may work, but we could not guarantee that they will fit correctly.