Will it fit my 12-inch Lodge skillet?

It is made for 12-inch Lodge skillets and pans with a matching rim. Measure the inside rim of your pan before buying, since a 12-inch cooking surface does not always mean a 12-inch rim.

Can I use it in the oven?

Tempered glass handles moderate oven heat, but it is not rated for the high temperatures bare cast iron takes, such as broiler settings. Keep it off direct flames and hot burners.

Does it have a vent hole?

No. The lid is solid glass, so steam collects and runs down the inside. That suits braising and steaming but can soften a crisp crust.

Is the knob oven-safe?

The silicone knob is there to stay cooler on the stovetop. It tolerates normal oven heat but not the extremes a bare cast iron skillet can take.

How should I clean it?

Hand wash with warm soapy water and let it dry fully. Avoid sudden temperature changes, like moving it from a hot oven to cold water, which can crack tempered glass.