For a fixture in panels up to 9 mm thickness. Fixed by: slotted nut M8 x 0.5, hole Ø 8.2. A fixture using special tool MWZ 4 and Allen key 6-Kant 1.5. Contact parts: nickel-plated. Insulation: PA 6.6 (Polyamide). Fastening nut (slotted nut): nickel-plated.