Does this hold 4mm bits?

Yes this product holds 4mm bits

Are the bits themselves magnetic?

No the bits themselves are not magnetic. Over time, they do pick up a small amount of residual magnetism though. They are held in the storage area by magnets in the step and they are held in the tip during use by a small rare earth magnet in the body of the tool where the tips are placed.

Is it tsa compliant? assembled with a bit still way below 7 inches but not sure about other considerations.

It is only four and three-quarter inches in length, and because it has no knife blade, it should pass through TSA with no trouble. However, if an agent opened it, and accidentally lost a bit or two, you'd probably not appreciate that. So, I'd recommend putting all tools, including knives, into your checked luggage. If you're not checking luggage, leave the most expensive tools at home, and make a stop a Harbor Freight for some cheap ones, after arrival at your destination.

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Description

🛠️ Fix it like a pro, carry it like a boss!

MAGNETIC BIT MASTERY - Innovative magnetic storage inside the handle keeps bits secure and swaps effortless—never lose a bit again.
RUST RESISTANT SLEEK DESIGN - Eco-friendly nickel finish and 60HRC hardness bits combine durability with a premium slate gray aesthetic.
ERGONOMIC ONE HANDED CONTROL - Polyhedral aluminum grip with whisper-quiet bearings ensures smooth, comfortable, and precise turns.
ALL IN ONE PRECISION POWERHOUSE - 24 high-grade S2 steel bits cover every tiny screw job from electronics to DIY.
THE ULTIMATE GIFT FOR MAKERS FIXERS - Compact, stylish, and ready for any repair adventure—perfect for professionals and hobbyists alike.

The HOTO 24-in-1 Precision Screwdriver QWLSD004 is a compact, pen-shaped toolkit featuring 24 durable S2 steel bits with a 60HRC hardness rating. It boasts a magnetic storage system integrated into the handle for quick bit changes, an ergonomic anti-slip aluminum grip with whisper-quiet bearings for smooth operation, and a rust-resistant nickel finish. Ideal for precision repairs on electronics, gadgets, and small objects, it’s the perfect blend of style, functionality, and portability for professionals and DIY enthusiasts.

Specifications

Manufacturer	HOTO
Part number	QWLSD004-Black
Item Weight	58 g
Product Dimensions	12 x 1.66 x 1.66 cm; 58 g
Item model number	P1-Black
Size	Precision
Color	Slate Grey
Material	Alloy Steel
Shape	Pen
Power source type	Hand Powered
Torque	2 Newton Meters
Item Package Quantity	1
Number Of Pieces	1, 12, 24
Head Style	Phillips, Flat, Hex, Torx, U-Shaped, Y-Shaped, W-Sharped, Tri-Wing, Triangular, Pentagon
Special Features	Ergonomic, Magnetic Tip
Specific uses	Tip: The maximum torque is 2N-m and is recommended for light duty.
Included components	①Magnetic Storage box for precision bits; Portable pen-shape design. ②24 types of bits, Meet more high-precision repair needs; High-quality S2 Steel Precision Bits. ③Screwdriver lid with bearing and slip-proof handle, Suitable for single-handed usage. ④Magnetic Slot for Bits, Convenient for the quick change. ⑤Machine Dismantling; Electric Appliance Repairing; Precision Assembling; Small-Object Repairing. ⑥Weight: 150 g / Size: 12 cm x 1.7 cm x 1.7 cm. ⑦Material: Aluminum.
Batteries Included?	No
Batteries Required?	No

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