The hex shaft portion on each is 83mm long +/- 1mm. The drive boss is 27mm giving a total overall length of 110mm. Hope this helps.

What is the outer diameter of the 10mm socket piece?

Largest dia where the drive enters the fitting is 18mm this reduces to 16mm where the shaft joins.

Lots of these hex bit sets omit a 9mm but, i see h9's can be bought separately. is 9mm a size that is unlikely to be encountered in domestic use? ta.

9mm isn't a common size so it's highly unlikely you'll come across it on anything domestic

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Bergen Long 7pc 3/8 HEX BIT SOCKET SET 3-10mm allen key B1123

Bergen Long 7pc 3/8 HEX BIT SOCKET SET 3-10mm allen key B1123

Product ID: 48161816

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Details

Brand
US PRO
Item length
110
Material
Alloy Steel
Finish type
Polished
Number of pieces
7

📏110mm extra-long shaft

🔩7 versatile metric sizes (3-10mm)

🧰Blow molded storage case

Description

🔧 Unlock precision and reach like a pro with Bergen’s Long Hex Bit Set!

ORGANIZED PORTABLE - Blow molded case keeps your set secure and ready on the go
EXTENDED REACH DESIGN - 110mm shaft length for hard-to-access hex fasteners
3 8 DRIVE COMPATIBILITY - Fits standard ratchets for seamless tool integration
COMPREHENSIVE SIZE RANGE - 7 essential sizes from 3mm to 10mm to cover all your hex needs
PRECISION ENGINEERED ALLOY STEEL - Durable, polished finish for professional-grade reliability

The Bergen Long 7pc 3/8 HEX Bit Socket Set (B1123) features a robust alloy steel construction with a polished finish, offering 7 metric sizes (3-10mm) on extra-long 110mm shafts. Designed for professional and DIY use, it fits standard 3/8" drive ratchets and comes neatly organized in a durable blow molded storage case, ensuring easy access and portability for tackling hex fasteners in tight or deep spaces.

Specifications

Manufacturer	Bergen
Part Number	B1123
Product Dimensions	15 x 10 x 4 cm; 400 g
Item model number	B1123
Size	Variety Pack
Finish	Polished
Material	Alloy Steel
Power Source	Hand Powered
Item Package Quantity	1
Number of Pieces	7
Measurement System	Metric
Compatible fastener range	Hex Screws & Nut
Included Components	hex bit sockets
Batteries included?	No
Batteries Required?	No
Item Weight	400 g

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