Made of high-strength aeronautical aluminum. - colored anodized
60% lighter than stainless steel. TYPE: NUTS WITH COLLAR FOR THREAD SIZE: M8 X 1.25 FOR SCREWS-Ø: 8.0 MM SELF-LOCKING: NO WRENCH WIDTH: 12MM Material: Aluminum SURFACE: BLACK ANODIZED RESISTANCE CLASS: NO RESISTANCE CLASS SPECIALTY: WITH NECKLACE