Reducing ring with metric connection thread and metric internal thread according to DIN EN 60423, halogen-free. Tightening the reducing ring by hand is only recommended! External thread: M 25 Internal thread: M 16 External thread length: 7.5 mm Internal thread length: 9.5 mm Wrench size: 30 mm Operating temperature range: -30° to 60°C Glow wire test according to DIN EN 60695-2-10+11/VDE 0471-2-10+11: 650° Material: Polystyrene Color: light gray RAL: 7035 (similar)