Aluminum Threaded Collar

2" dia. strut tube, 2.5 I.D. spring, aluminum with steel rings pressed into ends for welding to strut, 5" long They have a spring perch nut and a jam nut which allow you to raise or lower the car and does not damage the threads when locking the spring perch in place. The collars are designed for a 2.5" ID coil-over spring.