3mm wide beautifully articulated snake chain, extends from 16 to 18 inch. Lobster closure, very strong. This chain is not for pendants with tiny bails, bail of pendant must be 7mm wide minimum to be able to slip onto this chain. Also snake chains are not recommended for sleeping in or strenuous activity due to the nature of all snake chains which will bend permanently if abused. Correctly cared for it is a piece that will last a lifetime.