Question 1

Is there a adapter to use these bits with a normal 4mm? With the 6 grooves it just spins.

Accepted Answer

hi friend, it is a good suggestion,i will tell our engineer ,maybe we will have adapter for the driver with 4mm soon

Question 2

I'm a pro computer tech. I've had many tools wear out after a couple days worth of work,which begins to strip screws. How durable are they?

Accepted Answer

@Phils Stuff
He said he doesnt think they are made out of "Tool steel", not to imply that they arent metal.
Tool steel is usually something like O2, D2, A2
Tools Steels are SPECIFIC types of steel

D2 tool steel is an air-hardening, high carbon, high chromium tool steel with extremely high wear resisting properties. D2 is commonly used in long production, cold work applications, high wear applications and it is very popular as a knife blade steel. 
O1 Tool Steel is a general purpose oil-hardening tool and die steel
O2 tool steel is an oil hardening tool steel which is supplied in the annealed condition and characterized by its characteristics of offering good durability.  02 steel is a good quality general purpose tool steel often used where the expense of a high carbon high chromium tool steel would not be justified.
A2 air-hardening, medium-alloy, cold-work tool steels are a type of group A steels containing molybdenum and chromium. The carbon content in A2 tool steels is high. A2 tool steels can be deep hardened in order to minimize distortion.

Different grades of tool steel have different characteristics depending on what kind of tools they are being used for.

Question 3

The pieces are magnetic?

Accepted Answer

Yes, they are definitely magnetic. They have the perfect amount of magnetism: not overly strong, not too weak. Bought mine in May 2016.

Question 4

What is the size of the hex end?  Is it a standard 1/4 inch?

Accepted Answer

I do not have one yet but from looking at the drawling...
The HEX side of the bit looks twice the size of the shaft which is 2.5mm & looks about half the size of the holder that is 7.5mm so this part looks to be 4MM which is listed as the "Head Size". If you move up the tool you see another HEX which holds the "Head" holder. This piece looks slightly smaller then the 7.5mm so it would be a safe guess that this is the standard 1/4" tool size.

I believe all of the answers have been correct for their understanding of your question. I hope this help you & others.

ASIN	B00QZLV03O
Best Sellers Rank	492,753 in DIY & Tools ( See Top 100 in DIY & Tools ) 4,556 in Screwdriver Sets
Brand	Nanch
Colour	Silver
Customer Reviews	4.7 4.7 out of 5 stars (3,538)
Head Size	22 pieces
Head Style	Mixed
Included Components	One aluminum screwdriver handle with 22 bits,one collection case
Item Dimensions	14.5 x 6.5 x 3 centimetres
Item Weight	10.2 Ounces
Manufacturer	Nanch
Material	Tool Steel
Model Name	H8-S2
Model Number	H8
Number of Items	1
Part Number	H8
Recommended Uses For Product	Computers,Ring doorbell,Smartphones or Tablets,Toys,etc.
Set Name	22 in 1 Mini Screwdriver Set
Special Feature	Magnetic Tip
UPC	707152358675
Unit Count	22.0 count

Precision Screwdriver Set with 22 Magnetic Bits for All Electronics Devices,23-Piece

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