Is interlock the correct word<br/>here is a video<br/><div class='ytl __responsive' style='visibility: inherit; '><iframe class='youtube-player' type='text/html' width='640' height='393' src='https://www.youtube.com/embed/0QH0IA8AD6M?autoplay=0&amp;wmode=opaque allowfullscreen' frameborder = '0'></iframe></div><br/><br/>The chips interlock as you apply pressure the sides.<br/><br/>Thanks