Ideal for supplying power to heating elements.
These are female receptacles that flange mount, they are unused and in original boxes with mounting screws. White plastic. They require 2 1/8" holes to mount. 3 wire, 30 amp, 240v twistloc.
Selling as a pair, bought for about 20$ each, selling for 35 for the pair plus shipping. These are a bit more than 20$ in hardware stores, I found these on the internets.
Let me know if you want pics.