Prevelo Combo Chain Lock The Prevelo Combo Chain Lock offers practical security for young riders and their trusted steeds. Crafted a square-link steel chain and encased in a durable fabric sleeve, to protect the bike from unnecessary scratches. The four-digit combination lock eliminates the need for keys and provides 9,999 possible combinations. Sized with kids in mind, this lock is lightweight and manageable without sacrificing peace of mind. Whether locking up outside school or a café, it’s a straightforward, dependable layer of protection that fits neatly in a backpack. Specifications: Chain link diameter: 5mm hardened steel Length: 60cm Weight: 306g Combination lock (no keys required). Set your own 4-digit unlock code. Fabric sleeve with Prevelo branding for scratch protection Simple. Functional. And a little tougher than it looks.