Feature - Color: Black. - Material: Zinc Alloy and Adhesive. - Size: 21.5x7.6x2.5cm. - EASY TO USE: So easy to use, your children can use the lock without you worrying or dealing with them losing the keys. This lock is so easy to use that we have found that quite a few customers use it as a gate lock or even as container lock. - KEYS-FREE PROTECTION: Keep your bike or gate safe and secure without the need to carry keys that can be lost. The combination can only be set when the lock is open, as several of our customers wrote in answer to question. You can see their reply in the Questions and Answers below. - YOU DEFINE THE COMBINATION: Set a combination that is easy to remember with the resettable combination. - This U Lock is for bicycles, skateboards, sports equipment, gates and fences, grills and lawnmowers, tools, tool boxes ladders Scooters, Carriages, Mopeds, Motorcycles and so on.