Application: Hexagonal screw heads and bolts with wrench sizes 10-13 (metric) or 7/16"-1/2" (imperial) Design: Insulated, individually tested as per IEC 60900; 2-component plastic foam insulation; self-setting spanner with ratchet function; mouth side adjustable in size, parallel smooth jaws; with 30° back-pivoting angle via the corner-width prisms in the jaw; anti-slip protection at the front end of the handle; sliding function for contactless and safe opening of the non-insulated jaws; hole for hanging