Leave hand fatigue behind when installing lots of aligning key-locking inserts. These installation tools have a slotted end that fits around the keys of the insert to thread it into place instead of using your fingers. After you strike these tools with a hammer to drive the keys into the material, a spring engages to return the striking end to its original position. This way you don’t have to manually reset them after each installation. Choose tools that match your insert’s thread size and tap thread size.