(patented) Galvanized fastening kit for 2-wing MECHANICA hinges on flat profiles, with: 2 zamak counterplates 20×11 mm, 4 galvanized special screws for counterplate fastening M8x28, 2 galvanized socket head cap screws M4x16 for cover fastening, 1 galvanized grub screw M6x8 for cam bushing fastening, 2 pre-hardened burnished steel leaf springs.