Antique Copper Mens Bike Chain Bracelet, Adjustable with Extender Chain. Unique antique copper plated steel bike chain bracelet, 21x6mm, 6 inches long plus a 2 1/2 inch extender chain. The lobster claw clasp and extender chain are both silver plated steel, for a durable and stylish men's bike chain bracelet that can be worn every day.