You are buying a set of two stainless steel wrist or ankle cuffs. These cuffs have two style . that is held in place with a Philips head screw from the inside of the cuff. These cuffs are made from roughly 1/8inch thick stainless. Please see the different available sizes for interior length and width measurements. These cuffs secures with a small hex screw that is integrated into the locking tab on the side opposite of the hinge. The cuff locks when the hex screw is screwed into a small grove on the lower portion of the locking tab, thereby preventing the cuff from opening. Each cuff can be removed by giving the screw 1-2 turns with the included hex key. Please do not fully remove the hex screw, as re-inserting it can be a pain & it can easily be lost if dropped. Circumference of internal size: S=168 mm(6.6 inches),M=185 mm(7.3 inches),L=200 mm(7.9 inches),XL=230 mm(9 inches),XXL=260 mm(10.2 inches) Shipping policy : All items will be shipped to buyer's confirmed Aliexpress.com address. Before you pay, please make sure your address matches the address you would like us to ship to. Items are shipped by: China Post registered (for most Worldwide destinations) Note: you will get tracking number after shipment confirmation, which you can use to track your parcel online. Parcels reach most of the countries within 7 to 20 business days. Delivery time depends on destination and other factors, it may takes up to 20 or 35 business days. We try our best to provide you the most reliable, affordable way of shipping service. But sometimes international delivery is highly depended on the local customs and post service. If you do not receive your item on time, please contact us immediately for further assistance. We will be responsible for any damages or losses incurred in the shipping process. Items will be shipped within 10 business day o