Fits 13" - 15" wheel rims with tyre sizes 165mm to 205mm. Ideal for caravans. Fits onto security bolt in under 10 seconds. Sold Secure tested and approved. Locks onto the wheel instead of over the tyre. Specifically designed for alloy wheels. Unique high security patented locking system. Millions of key combinations. Water and corrosion proof. Registered product design. Plastic storage case included.