Provided is a bending device that includes a processing part having two protruding parts that protrude from an end surface of a pillar part and that bend a wire, a rotary part that supports the processing parts and rotates about an axis intersecting the length direction of the pillar part, an accommodating part that is cylindrical and accommodates the rotary part at an end part of the accommodating part so as to be rotatable, and a mechanism that rotates the accommodating part about an axis of the accommodating part.

Canted coil spring rings each with a first plurality of coils having first coil major and minor axes; a second plurality of coils each having second coil major and minor axes; the coils of the first plurality of coils alternating with the coils of the second plurality of coils according to an alternating pattern. The spring rings having inner and outer perimeters and wherein the inner perimeter of the spring ring is defined by at least said first plurality of coils. The resulting configuration of the spring ring has improved spacing along the inner perimeter, among others, with respect to a similar canted coil spring ring having a constant coil cross section, such as a coil length with all similar coils.