Cannulated top-loading polyaxial pedicle screw system featuring the ability to accommodate titanium and CoCr rods of two different diameters. The innovative lead thread pattern allows faster insertion and demonstrates increased pullout strength. The mixed metal tulip minimizes head splay and improves mechanical performance. The implant technology is state-of.the-art with serveral enhancing features to facilitate more efficient intra-operative use of the system. The EVEREST polyaxial screw provides 70° range of motion and featurea a CoCr head to minimize head splay, optimized dual lead thread designed to increase fixation in bone, easy to start set screw facilitating set screw introduction, and the ability to accept both 5.5 mm and6.0 mm diameter rods.