Simple to use nickel plated locking pin keepers/pin locks keepers/pin locks and 1 Allen wrench. They can be used to secure pins on lapel, motorcycle leather vest, jacket, cap, hat, work uniform, law enforcement uniform and much more. Simple to use nickel plated locking pin keepers/pin locks keepers/pin locks and 1 Allen wrench. They can be used to secure pins on lapel, motorcycle leather vest, jacket, cap, hat, work uniform, law enforcement uniform and much more.