Is the internal or external dimension 20mm? I need this to connect 2 pieces of 20mm x 20mm wood together

20mm is the external dimension. The internal dimension is 16mm

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Galvanised Mild Steel Sections | Flat Bar | Square Tube | Rectangle Tube | Angle Iron (Square Tube - 40mm x 40mm x 3mm, 1000mm)

Product ID: 539982578

Details

Brand
KIMETALS
Colour
Silver
Item diameter
40 Millimetres
Material
Square Tube -
Shape
Square

📏Precision-cut sizes up to 7.5m

⚙️Durable 3mm thick galvanised steel

🛠️Versatile for bending, drilling & welding

Description

⚡ Elevate your build with precision steel that means business!

SIZE MATTERS - Wide range of sizes and lengths up to 7.5 meters to fit any structural demand.
BUILT TO LAST - Galvanised mild steel ensures superior corrosion resistance and longevity.
TRUSTED QUALITY - UK-made commercial-grade steel with a 4.4-star rating from professionals.
VERSATILITY AT ITS BEST - Perfect for welding, bending, drilling—ideal for all metal fabrication needs.
TAILORED TO YOUR PROJECT - Free cutting service for up to 2 precise cuts—customize without hassle.

KIMETALS Galvanised Mild Steel Sections offer premium 3mm thick, corrosion-resistant steel in multiple shapes and sizes, including square tubes (40mm x 40mm x 3mm). Designed for professional metalworking, these UK-made sections support bending, drilling, and welding, with customizable cutting options and lengths up to 7.5 meters—perfect for durable, versatile fabrication projects.

Specifications

ASIN	B09BM52FQT
Best Sellers Rank	306,663 in DIY & Tools ( See Top 100 in DIY & Tools ) 3,124 in Brackets
Brand Name	KIMETALS
Colour	Silver
Customer Reviews	4.5 4.5 out of 5 stars (36)
Grade Rating	Commercial
Item Diameter	40 Millimetres
Item Form	Sheet
Item Shape	Square
Item Thickness	3 Millimetres
Item Weight	3.36 Kilograms
Manufacturer	KIMETALS
Material	Square Tube - 40mm x 40mm x 3mm
Unit Count	1.0 count

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