The torsion springs are usually used on a self closing door or lid, such as a garage door. The torsion springs get their name from the winding coil of wire that makes up the spring. The torsion springs have a wire diameter from .008” to .437” and come in a variety of wire types & shapes including square and rectangular. End configurations include external hooks, bend across center, etc. You must specify helix direction. Imperial manufactures the torsion springs and wire forms at our main site in Milldale, Connecticut, and a satellite facility in Southbridge, Massachusetts. Our skilled employees serve customers worldwide and our company is known internationally within the torsion springs industry. Our mission is to provide our customers with cost-effective solutions, total quality and commitment and deliver precision engineering, professional staff and hand on service that maintain our industry leadership. For more information on torsion springs, visit our web site at www.imperialspring.com or call 860.628.9611. Please contact us today to learn how we can be of service to you for all of your spring needs.