Material: Stainless Steel Two version of this product.Difference is how to lock the ankle ring.All by Handmade. 1.PadLock version-1.2cm thickness,takes around 10days for making 2.Screw Lock version-0.7cm thickness,takes around 10days for making 3.Padlock version-0.7cm thickness,takes around 10days for making Ankle Ring Size: there are 2 sizes of ankle ring for choose,marked female size and male size. Female Size: 65mm*75mm (approximate) Male Size: 75mm*85mm (approximate) Other parts size as picture shown. This device is customizable(cuffs size and plate).Customize service cost extra $30. I mark it as female size or male size just for reference, you can decide what size you need by yourself. For example, plus size women choose Male Size is reasonable. This device can also work with chain,the attached ring on ankle ring offer this function.If you need this function,you can buy chain locally and connect with 2 padlocks,then chain would be functional by then.