supply of rigid poly screw for posterior anterior spinal system. used for thoracolumbar fixation and stabilisation in spine trauma, degenerative and tumor surgeries in both anterior and posterior construct. pedicular screws should have a reverse threaded mechanism and should be compatible with 5.5mm titanium rod. screws should be available in sizes of 4.5, 5.5, 6.5 mm diameter and 25-55mm in length. system should have break off plug mechanism.screw should have an angle of not more than 28 degree between the head and body. system should be compatible for minimally invasive surgical technique and also be used along with fenestrated or / and hydroxyapatite coated screws. system should be registered with drug controller general of india. system should be iso or bis or fda or ce approved. unit:no