Crouse-Hinds TP589 Square Cover, 4-11/16", Natural, Raised surface, two device, Steel, 1" raised, 11.7 cubic inch capacity

Two. The TP589 is a two device raised surface cover, so you can bring up a pair of devices (for example two switches, or a switch and a receptacle) through one 4-11/16 box.

It does. The TP589 adds 11.7 cubic inches of usable volume on top of the box, which counts toward your box fill calculation when the cover is marked with its capacity. The 1 inch raise is what creates that extra room for device bodies and conductors in a crowded box.

One inch. The raise on the TP589 is 1 inch, so the device faces sit an inch proud of the box rim. On surface mounted conduit work that is what lets a standard device sit in the cover rather than down inside the box.

Use the TP589 when the box is surface mounted on a wall or ceiling and the devices have to be carried up to the finished face, since the 1 inch raise holds the two device bodies and adds 11.7 cubic inches of volume. A flat blank cover is the choice when the box is a pull or junction point with no devices, and a recessed plaster ring is what you want when the box is buried in drywall rather than exposed.

Steel, supplied in a natural (unpainted) finish. It weighs 0.38 lb. Natural steel is normal for exposed surface work in dry interior locations; for a painted or corrosion resistant appearance you would need to finish it in the field.

Order by manufacturer part number TP589, Eaton Crouse-Hinds series. It is a single configuration item, so there is no finish or size option to specify.