This dog collar material: hand polished 316L stainless steel chain. High strength and hardness, heavy, durable, no rust, no discoloration after years of use. We have designed a special snap for your dog, please check the details shown in the pictures. The latch is easy to lock and unlock but it's so strong that even 700lbs of force can't pull it apart Collar Size and Fit: Chains are 19mm (0.75") wide and 15" to 26" long. Please note that this chain is not adjustable, please use a string or measuring tape to measure where you want the collar on the dog's neck, then add about 1-2 inches. Luxurious Cuban links are cool for both boy and girl dogs. Three sizes: 19MM wide, 45CM; 19MM wide, 50CM; 19MM wide, 55CM; What I like about this chain: The walking chain is strong and heavy because it is not hollow. The high polish finish makes for a shiny, smooth and comfortable finish, so we're sure your dog will be delighted to own this collar. Welded stainless steel D-rings for attaching tags and leashes, very strong, don't worry about breaking.