Square Cover, Plaster Ring, Mud Ring | 4 in Square, 1/4 in Raised Single Device Cover Drawn | Clip,Multi-Function,Wire Rod Flng | Exclusive Design Reduces Rippling and Ovaling of Conduit | Explosion Proof, Dust Ignition Proof; Two Hub, One Plug; for Use With Threaded Metal Conduit; for Use in Wet Locations | Quick Connect in Power Tools | Reduce Time on Projects With Large Quantities of Conduit RunsFurbay Electric Supp