These reproduction pendulum rods are for wooden movement tall case clocks. They are made from 1/8" steel rod and have a rolled spring at the end. They measure 40 inches long which is standard for production-era wooden movement tall case clocks. Depending on the weight of the pendulum bob, you may need to cut the rod down and bend a new hook at the bottom which is very easy to do at home. You are buying ONE pendulum rod per purchase.