Klein Hollow Magnetic Color-Coded Power Nut Drivers, Metric, 6 Pieces (32940M)

Key Features
Hollow for Threaded Rod
A 3-3/4" hollow depth runs nuts down all-thread and long bolts without bottoming out.
Magnets Scale With Size
Rare-earth magnets get larger with each hex size, so big nuts stay seated as well as small screws.
Impact-Rated
High-grade impact steel holds up to impact drivers on demanding driving jobs.
Color-Coded Metric Sizes
Six metric sizes, 7 to 14 mm, each color coded for a quick grab.
Overview
The Klein Tools Hollow Magnetic Color-Coded Power Nut Drivers, Metric, 6-Piece (32940M) is a six-piece set of hollow-shaft metric nut drivers for drills and impact drivers. This is a power nut driver set designed for driving nuts and hex screws on threaded rod, long bolts and recessed fasteners in electrical, mechanical and assembly work.
Sizes: 7 mm, 8 mm, 10 mm, 12 mm, 13 mm and 14 mm, each a 6-point hex on a 1/4" hex drive. The color coding makes it fast to find the right size in a pouch or drawer.
The hollow core is the main reason to choose these over standard power nut setters. With a 3-3/4" hollow depth, the driver can run a nut down threaded rod or a long bolt without the rod bottoming out in the socket. Each driver is 6" long for reach into recessed areas.
Retention comes from powerful rare-earth magnets that increase in size with each hex size, so fasteners are held securely for one-handed driving. The drivers are made of high-grade impact steel, impact-rated for the most demanding driving tasks, with a black oxide finish for corrosion protection.
No case is included. The set weighs 1.0 lb (454 g).
Who should buy it: electricians and mechanical contractors running nuts on all-thread for strut and hangers, equipment installers and assemblers working with metric hardware, and anyone tired of the standard nut setter bottoming out on long bolts.
Run Nuts Down Threaded Rod
The hollow shaft lets threaded rod pass inside the driver instead of stopping the nut short.
3-3/4" hollow depth
6" overall reach
1/4" hex drive
Strong Hold at Every Size
Magnet size increases with each hex size for secure fastener retention across the set.
Rare-earth magnets
Magnet scaled to hex size
One-handed driving
Built for the Impact
High-grade impact steel and a corrosion-resistant finish keep these working under impact.
Impact-rated steel alloy
Black oxide finish
Color-coded hex sizes
What's in the Box
(6) Hollow magnetic power nut drivers: 7 mm, 8 mm, 10 mm, 12 mm, 13 mm, 14 mm
No case included.
Key Specifications
Pieces
6
Hex Sizes
7, 8, 10, 12, 13, 14 mm
Points
Drive
1/4" hex
Reach
6"
Hollow Depth
3-3/4"
Magnet
Rare-earth, scaled to size
Yes
Material / Finish
Steel alloy, black oxide
Weight
1.0 lb (454 g)
Compatibility
Drivers
1/4" hex shank for drills and impact drivers
Built For
Electrical
Mechanical
Equipment Installation
Assembly
Facility Maintenance
Tool Nut's Take
The Nut Driver That Doesn't Bottom Out
The Klein Tools Hollow Magnetic Color-Coded Power Nut Drivers, Metric, 6-Piece (32940M) handle threaded rod and long bolts that solid setters cannot.
Who it's for: Electricians and mechanical installers working with metric hardware on all-thread.
Why it stands out: 3-3/4" hollow depth, size-scaled rare-earth magnets and impact rating.
Worth knowing: Metric sizes only, and no case. Plan on a pouch or bit organizer.
Common Questions
What sizes are in the Klein 32940M set? 7, 8, 10, 12, 13 and 14 mm.
How deep is the hollow shaft? 3-3/4".
Are they impact-rated? Yes.