FASTENERS & TOOLS | Explosion Proof, Dust Ignition Proof; One Hub; for Use With Threaded Metal Conduit; for Use in Wet Locations | Explosion Proof, Dust Ignition Proof; Two Hub, One Plug; for Use With Threaded Metal Conduit; for Use in Wet Locations | Plastic Safe, General Purpose | Precision Machined to Ensure Consistent Fit | Starts and Drives Screws With One Hand When Working in Hard-to-Reach Spaces