Power-bit nut driver for hex-head sheet metal screws, lag screws, and self-tappers. The 1/4" hex shank chucks into any standard impact driver or drill, and a strong rare-earth magnet in the socket holds the fastener square on the bit so it stays put while you start the screw - no fumbling, no dropped fasteners overhead.

• Hex socket: 5/16"
• Overall length: 2-9/16" (extended reach - clears panel edges and gets into recessed work)
• 1/4" hex power shank fits all standard impact drivers and 1/4" quick-change chucks
• Patented socket geometry grips the flats, not the corners, to reduce rounding
• Hardened tool steel for extended bit life under impact

Tip: Magnetic nut drivers lose grab after picking up steel filings - wipe the socket clean if screws stop holding. The 5/16" socket is the workhorse for hex-head roofing screws, self-tappers, and lag screws up through the most common construction sizes.