Extension Chain Gun Metal Per Metre. Curb chain style Gun Metal finish, 7 links per 2.5cm (1″). Sold by the metre. Here at Jillybeads we understand that some beaders can be a bit reluctant to buy online so if that’s you, give us a call as we are always more than willing to take your order over the phone, or even add an addition onto your existing order. We like to make your shopping experience as simple and easy as possible!