This is a club casserole cover.

it can be cooked in too.

it measures 10" across without the handles, 12 with.

it is used, but works fine.

it is 2 1/2 inches deep and you can cook in it.

it says Club 2.1QT casserole designed for microwave and conventional or convection over use up to 410 degrees and freezer storage, not for stove top use or broiler, made in the USA.

it is similiar to tupperware Ultra 21 or littonware, made of a hard resin for microwave or reg oven.