What is the external across the flats width of the 9mm spanner? Also the thickness of the spanner end material?

12mil externally. 2mil with regard to the material but because of the way they are pressed out this can vary a little.

Can these be joined together to extend the length of the one you need to use? I have a 14mm nut on a recess monobloc drinking water tap to remove?

Yes they can be but not every one of these fits the next level up i.e I tried fitting the smallest one into the next level and it did not fit but then tried fitting that into the 3rd one and it did fit.

Can these be used for spark plugs.

This set does not have a box spanner large enough for Auto spark plugs. But Silverline do sell a set to suit your needs.

How long area these, pls?

They range from 19cm to 12cm hope that helps

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Silverline 589709 Box Spanner Metric Set 6pce 8 - 19 mm, Silver

Silverline 589709 Box Spanner Metric Set 6pce 8 - 19 mm, Silver

Product ID: 50591266

Details

Brand
Silverline
Colour
Silver
Item length
19 Centimetres
Item weight
0.61 Kilograms
Material
Alloy Steel

📏Compact 19cm length for tight spaces

🔩6 double-ended spanners, 8-19mm

🛠️Corrosion-resistant alloy steel

19203CFA

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Description

🔧 Unlock every bolt’s potential with Silverline precision!

BUILT TO LAST - Durable corrosion-resistant alloy steel ensures longevity and reliability.
VERSATILE SIZE RANGE - Six essential metric sizes (8x9 to 18x19mm) cover all your fastening needs.
REACH THE UNREACHABLE - Tubular design with included tommy bar lets you access tight, awkward spots effortlessly.
TRUSTED BY PROS DI YERS - Highly rated with 4.5 stars from over 5,000 users—join the community of confident fixers.
PRECISION FIT MAXIMUM GRIP - Hexagonal heads grip all 6 sides to prevent slipping and maximize torque.

The Silverline 589709 Metric Box Spanner Set features six double-ended spanners ranging from 8 to 19mm, crafted from corrosion-resistant alloy steel. Its hexagonal tubular design with an included tommy bar enables superior grip and access to tight spaces, making it ideal for automotive, plumbing, and mechanical tasks. Compact and durable, this set is a must-have for professionals and DIY enthusiasts seeking reliable, slip-free fastening solutions.

Specifications

ASIN	B0015NPPGA
Best Sellers Rank	56,649 in DIY & Tools ( See Top 100 in DIY & Tools ) 23 in Box Spanners
Brand	Silverline
Colour	Silver
Customer Reviews	4.5 4.5 out of 5 stars (5,266)
Finish	Unpolished
Head Style	Hex
Included Components	1x Box Spanner Metric Set 6pce 8 - 19 mm
Item Length	19 Centimetres
Item Package Quantity	1
Item Torque	0.5 Newton Meters
Item Type Name	Box Spanner Metric Set
Item Weight	0.61 Kilograms
Jaw Capacity	19 Millimetres
Manufacturer	SLTL4
Material	Alloy Steel
Measurement Standard	Metric
Model Number	589709
Number of Items	6
Operation Mode	Mechanical
Part Number	589709
Set Name	Silverline Metric Box Spanner Set (6 Piece)

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19203CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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