A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted. When it is twisted, it exerts a torque in the opposite direction, proportional to the amount (angle) it is twisted. 

Inner Dia: 2.5mm

Outer Dia: 3mm

Length of Spring: 3mm

Length of arms: Short arm 9mm, Long arm 13mm

Arms relative position: 90 Degree

Torsional Strength: very light

Package Includes:

1 X Torsion Spring Micro (5pc set)

* Image is representational.