30 Pieces - System For Transpedicular Fixation Of The Spine: Screw - 4 Pcs. (Ø 5.5 Mm; L 45.0 Mm), Beam - 2 Pcs. (Ø 6.0 Mm, L 300.0 Mm), Nut - 4 Pcs., Transverse Tie - 1 Pc.