The Schluter-TROBA-LEVEL-PLA 70 Adjustable paver support extension (height = 2-3/4" [70 mm]) can be integrated with TROBA-LEVEL-PLV 60. Multiple TROBA-LEVEL-PLA 70 units can be used to reach the desired height up to a recommend maximum of 15" (381 mm). The thread features a vibration-lock mechanism to protect against accidental loosening.