Kahrs Woodloc 5S and Kahrs Activity Floors use the 5S locking joint to secure wood floor boards to each other. Use Kahrs Locking Tool to push the locking pin into locked position or to unlock the joint pin. The Locking Tool provides a safe way to manage the locking pins on these Kahrs wood floors without damaging the flooring surface. Kahrs advises flooring installers to lock pins in first row boards as they work in order to get the best finished results. Follow directions in the Kahrs Floor Installation Guide for your specific type of Kahrs wood flooring and use the Kahrs installation tools as directed.