FASTENERS & TOOLS | 4 in Square, 1/2 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 | Precision Machined to Ensure Consistent Fit | Reduce Time on Projects With Large Quantities of Conduit Runs | Rotating Cap for Optimum and Precise Control | Split Point Pilot Drill Bit and Integrated Flange