The torsion spring will provide force，when you twist them . They are usually cylindrical， round wire springs. Torsion springs can be made of square, flat or rectangular wires and can be made of any shape or size. The legs can be in any position and can be bent or cycled. We can make almost any design of torsion springs. If you need help, we have a responsive and experienced engineer team to cooperate with you. Contact our professional salesman to customize the torsion spring you need.