This is a .414 inch diameter (10.5 mm) 1 foot (30.5 cm) mandrel. It is homemade. It has a lot of surface rust, but it is in good functional condition.

The shipping calculator sometimes charges too much. If it is over by more than a few dollars, I will give you a refund for shipping. Also, if you purchase more than one item, I will send them together to save you money.