Self-adjusting insulation knife for single, multi-core, and fine-stranded conductors with plastic or rubber insulation. It automatically adapts to the respective cable cross-section and prevents damage to the conductor. The cutting depth can be adjusted for different insulation materials. It features a smoothly operating mechanism, easily replaceable stripping blades and clamping jaws, as well as a lightweight design. The capacity includes half-moon, square-in-square millimeters, square drives, stepped squares, triangular shapes, and clamping widths for hexagonal, round, and square forms.