The frame has a bending lever with height-adjustable rollers and a sliding vice for clamping the sample which means the test pieces are bent perfectly and regularly on decreasing mandrels until the desired effect can be observed.

The instrument can be adjusted to the diameter of the mandrel used and the mandrels are easily changed.

A wide range of mandrels with metric and imperial diameters is available. Mandrels are not supplied with the instrument and can be ordered as a set or individually.