Whats the country of origin? Bits vary substantially even with the same brand.

I got these bits a couple of years ago there's no chance that I've still got the box, so I couldn't tell you what country they're from my guess is China but I don't know that for sure. As to the quality these bits work fine. They hold their edge and they fit good quality screws very well

Actual size? which part of this tool measures 45.01cm? which part of is made of "polished stainless steel"?

I believe this is an incorrect write up for the product. They are 57mm long and to be used in an 1/4 drill impact driver. They aren’t stainless either as they come as impact material and finished in Matt black.

Does this item include the magnetic screw lock

Yes as long as you bought the DEWALT DEWDT70535T Impact Torsion 2 x PZ2 50mm and Magnetic Screwlock Sleeveas the ad States " magnetic screw lock enables tasks to be completed quicker and easier, reducing instances of dropped or lost screws."I hope this help P ClarkeIts a super tool and to be honest worth buying more than one or two but the item you ask about are just 5 Bits so to speck, the unit the bit load into has the magnetic screw lock system built in to that .Please note I do not Work for Amazon Kind Regards RGP

Do these fit the Dewalt magnetic screw lock sleeve

It is the standard hexagon configuration for all the bits I've seen/ used. If you have any version with a dimple (allowing for the locking mechanism), and it fits your kit then this product will also work. I bought mine for a Dewalt DC835 screwdriver. Fits perfectly. Don't use anything other than torsion bits, you'll be wasting your money.

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🛠️ Master every screw with precision and power — don’t let your toolkit fall behind!

COMPACT 50 MM LENGTH - Ideal size for versatile access in tight spaces without sacrificing control.
MAGNETIC SCREW LOCK - Keeps screws firmly in place, speeding up your workflow and eliminating frustrating drops.
FULL FIT PRECISION HEAD - Engineered PZ2 IR design ensures perfect engagement with screws, preventing rounding and slippage.
DURABLE METAL CONSTRUCTION - Polished metal finish built to withstand extreme impact and heavy-duty use.
SHOCK ABSORBING TORSION ZONE - 15° torsion zone reduces bit stress and prevents screw cam-out for longer bit life.

The DEWALT DT7391TQZ pack includes five 50mm PZ2 IR torsion bits featuring a 15° torsion zone to absorb impact and prevent screw damage. Magnetic screw locks enhance efficiency by securing screws during use. Crafted from polished metal for durability, these bits are optimized for impact drills and designed to deliver precision and longevity in demanding tasks.

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Manufacturer	Dewalt
Part Number	DT7391T-QZ
Item model number	DT7391T-QZ
Size	57mm x 6mm
Colour	Multi
Style	PZ2 IR
Finish	Polished
Material	Metal
Power Source	AC
Item Package Quantity	1
Number of Pieces	5
Measurement System	Metric
Compatible fastener range	Fasteners compatible with impact drills DeWalt
Included Components	Extreme Impact Torsion Bits PZ2 x 50mm (Pack 5)
Batteries included?	No
Batteries Required?	No
Battery description	Not Included
Item Weight	40 g

Dewalt DT7391TQZ 50 mm PZ2 IR Torsion Bits (Pack of 5)

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