FASTENERS & TOOLS | 4 in Square, 1/2 in Raised Single Device Cover Drawn | Clip,Multi-Function,Wire Rod Flng | Explosion Proof, Dust Ignition Proof; One Hub; for Use With Threaded Metal Conduit; for Use in Wet Locations | Features Include Ease of Installation, Immediate Loading Capabilities, and the Tamper-Resistant Nature of the Finished Assembly | Features Low Battery Indicator | Hanger,Box,Acoustical Tee,24span | One-Step Installation Process Reduces Installtion Time and Cost