Fits XRAY NT1 XRAY NT1 - 2009 Specs XRAY NT1 EC XRAY NT1R XRAY NT1 - 2010 Specs XRAY NT1 World Champion Limited Edition XRAY NT1 - 2011 Specs XRAY NT1 - 2012 Specs XRAY NT1 PRO XRAY XB4 XRAY NT1 - 2013 Specs XRAY XB4 2014 Specs XRAY XB4 2WD Alu servo saver spring-tension adjusting nut. The strength of the servo saver can be easily adjusted through the adjustment nut.