Zinc Caps are screwed into the core bores. These Caps are particularly resistant to mechanical loading and changes in temperature. They can be unscrewed and screwed back on any number of times.
They must be secured in the core bores in the profiles using countersunk screws 8 SF M7,1×16. No threads need to be tapped to do this.
Cap 8 40x40 Zn, black - 0.0.427.09