The Kaweco DIA was originally launched back in the 1930s, and has the unique design feature of knurling on the screw-on cap and barrel.
The Kaweco DIA 2 rollerball is made of acrylic resin on CNC-precision-machined aluminium. The clip is made of chrome plated brass. It measures 135 mm closed and 160 mm with the cap posted. It uses a Euro refill.
The DIA 2 comes in a high quality box with a leatherette cover.