This is the upgraded screw used by Precious Plastic. The only difference is the diameter which is 24.7mm instead of 25.7mm diameter.
If you do not have a 26mm round tube available in your region, you can use this screw.
It fits a 25mm round tube and it is made of hard material 38CrMoAlA Steel.
If you need the tube too, please see this listing:
Availability: Late September
Domestic Shipping: €15
International Shipping: €50 (Europe), €40(Central America), €50 (South America)