For what do we need coax cable and how they are stripped?

Coaxial Cables are consisting of a pair of concentric positioned conductors. The inner conductor can be either solid or stranded. It is covered by a dielectric insulation material, around which the second conductor in form of an aluminium foil or mesh protects the inner conductor against parasitic induction. This shielding is covered by a second insulation sheath. Coax cables are used for a distortion-free transfer of high frequency bandwidth transfer signals , e. g. in cable-TV or ethernet systems. The Secura No. 1 (part no. 30600) strips both, the outer sheathing and shielding as well as the dielectric insulation to prepare a professional connection to coax plugs and connectors.