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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🔧 Forge Your Future with Steel Innovation!

SAFETY FIRST - Handle with care to avoid sharp edges post-cutting.
BUILT TO LAST - Galvanised for superior corrosion resistance, ensuring longevity.
EASY TO WORK WITH - Designed for bending, cutting, drilling, and welding with ease.
PRECISION ENGINEERING - Perfectly crafted for accuracy in all your metalworking projects.
UNLEASH YOUR CREATIVITY - Transform your ideas into reality with our versatile steel sections.

Our Galvanised Mild Steel Sections, including Square Tubes, Angle Iron, and Flat Bars, are engineered for durability and versatility in metalworking. Weighing 8.41 kg and featuring dimensions of 40mm x 40mm x 3mm, these sections are ideal for a variety of applications, from structural support to intricate fabrications. Handle with care to ensure safety during your projects.

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