2 1/8" X 4", for use with 2018 and 2020 series boxes.

20-C-1
Opening for one Duplex receptacle.

20-C-3
1.40" opening for single receptacle.

20-C-4
Blank.
Box mount.
20-C-5
Opening for one toggle switch.
2 1/2" X 4", for use with 1110 series boxes.

11-C-1
Opening for one Duplex receptacle.

11-C-10
Opening for GFCI.

11-C-2
1.625" opening for single receptacle.

11-C-3
1.40" opening for single receptacle.

11-C-4
Blank.
Box mount.

11-C-5
Opening for one toggle switch.
3.7" cubic capacity.