Nihon Trading Company offers Hook Type Extension Springs. Nihon Trading Company also offers various types of metal mould springs and manufactures various types of indent components. The Hook Type Extension Springs are used in car, industrial machine, brake, absorber, steering, door hinge, transmission, agricultural machine and heavy equipment. The Hook Type Extension Springs are designed to absorb and store energy creating a resistance to a pulling force. These Extension Springs are available in wire diameter ranging from 0.3mm to 12 mm.