The buckle frame is thick and solid, and the roller and the buckle frame are about the same thickness, making the roller part less noticeable.
The pins are fixed in place so that they do not move significantly from side to side.
Material: Zinc alloy (nickel-free)
A: approx. 13.5 mm
B: approx. 2.8 mm
C: approx. 2.5 mm