4 Square To 3-1/2 Round Adjustable Device Ring - Raised 3/4 To 1-1/2

4 Square to 3-1/2 Round Adjustable Device Ring - Raised 3/4 to 1-1/2

4 Square To 2-3/4 Round Universal Fixture Ring - Raised 5/8

4 Square To 2-3/4 Round Fixture Ring - Raised 1/2

4 in. Square Adjustable Mud Ring, Two Device, HBL769AMR

Steel City 1-Gang Square Mud Ring 52C13-50R - The Home Depot

Electrical Box Extension Ring

Iberville 53151 - 4 in. square extension ring 21.0 cu in. 1-1/2 in. deep

Hubbell-Raco 111 Extension Ring Ceiling Outlet Box, 11.8 Cu-in, 3

Crouse-Hinds AMR1 3/4 to 1-1/2 1-Gang Steel Raised Adjustable

Duct Hangers and Supports

RACO ROUGH-IN READY 4 in. W White 1-Gang Prewired GFCI Outlet

4 Square To Round Perfect Fit Device Ring - Raised 1

Square-Box-Plaster/Mud-Rings