These exclusive heavy ankle cuffs are the TOP products of the year. They are locked with a neatly integrated lock. 3 keys are included for each lock. The shape is round with an inner diameter of 80 mm. The rings can be removed when the lock is opened. Inner diameter rings 22mm. The height is 30 mm and the thickness is 7 mm. The total weight is approx. 860 grams. Material: polished steel. You can find more steel restraints in our shop.