Question: To put a hole in the bottle cap pendant to thread a chain or a string through.
Options:
Use a 1.8 mm punch pliers to punch a hole on one side and repeat on the opposite side, so you have two holes lining up straight in the middle of the cap.
Use a 10 mm punch pliers to punch a hole on one side and repeat on the opposite side, so you have two holes lining up straight in the middle of the cap.
Answer: Use a 1.8 mm punch pliers to punch a hole on one side and repeat on the opposite side, so you have two holes lining up straight in the middle of the cap.