❤ Made of hard alloy steel with PVC coating. ❤ Protect your bike from various methods of thief effectively. ❤ Equipped with mounting bracket can easily fix on the bike tube(Max. 55mm/2.1in) when you do not need. ❤ Resistant to cutting,breaking,sawing and shearing. ❤ Rotating dust cover prevents corrosion of water, dust and dirt.