This Falkx ring lock is ideal for use with your bicycle. The lock can be easily attached to the frame, so you'll never forget to bring a lock. With a simple turn of the key, the bracket is turned and your bicycle is securely locked. The ring lock is an effective measure against theft. The internal mechanism is made of steel and the casing is plastic. The lock is black and has a 56 mm wide opening. The lock weighs 410 grams. Product specifications: - Plug-in option: no - Opening width: 56 mm - Weight: 410 grams - Color: black - Internal mechanism material: steel - Casing material: plastic - Mounting: on frame. Contents: - 1 ring lock - 2 keys - Mounting hardware.