Insulation stripper with replaceable blades for four (adapted to diameters) or six (adapted to cross-sections) different conductor cross-sections. Leaves wire undamaged thanks to precision-ground blade shapes; even multi-stranded conductors are stripped gently. During stripping, the wire is held firmly by clamping jaws. Features a length stop for constant stripping length during repetitive work. Capacity includes half-moon, square millimetres, square drive, step-like square, triangular, and clamping widths for hexagon, round, and square shapes.