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: 4.8mm

Outer Dia: 5.5mm

Length of Spring: 4.5mm

Length of arms: 11mm

Arms relative position: 70 Degree + -

Torsion strength: Medium

Package Includes:

1 X Torsion Spring Small (5pc set)