1. Front steel plate (I), length 20mm-38mm, length interval 2mm.
2. Front steel plate (II), length 35mm-56mm, length interval 3mm.
3. Front steel plate (III), length 50mm-74mm, length interval 3mm.
4. Front steel plate (IV), length 74mm-92mm, length interval 3mm.
5. Anterior cervical fixation screws, diameter 4.5mm, length 10mm-24mm, length interval 2mm.
6. Anterior cervical fixation screws, diameter 4.5mm, length 10mm-24mm, length interval 3mm.