Alloy round - 12.8 mm (1/2 in) Ø
Details
Alloy round - 12.8 mm (1/2 in) Ø. Black anodised colour. 0.7 mm wall thickness.
As with most drawn alloy tubes the surface is rather grainy and this is accentuated when the tube is natural anodised.
As an alternative we suggest using 12.7 mm diameter alloy GROOVY mast section, ref. AG-127.
Guidance on pens suitable for marking difficult surfaces - here.