Heavy-duty chain lock rated as Sold Secure Silver. Manufactured for Gocycle by Luma, one of Europe's highest rated lock manufacturer. Specifically designed to integrate with the Gocycle Lockshock. When installed on the Lockshock, the lock body has an additional security feature of preventing the pedal cranks from turning. Requires a saddle bag, backpack or pannier for carrying, as this is a heavy-duty item. The Altura Expanding Seat Pack will fit this lock. Weight 3kg. Note: Karbon Kinetics Limited does not provide a guarantee that this lock is 100% effective against the theft of a Gocycle product.