[Size] - The combine size of the turn lock clasp is 42mm x 20mm x 6mm/1.65" x 0.79" x 0.24"(L*W*H); Lock Inner Hole Size: 30mm x 7mm/1.18" x 0.28"(L*W); Fit for 3mm/0.12" thickness [Material] - Made of alloy material, with hanging plating and oil...