These heavy dungeon wrist irons made of stainless steel come in two sizes. The ladies size\'s height is 40 mm, the thickness is 9 mm, the inner diameter is about 4.3 cm x 5.2 cm. The men size\'s height is 40 mm, the thickness is 7 mm, the inner diameter is about 5 cm x 6.5 cm. The cuffs are connected by two swivels and a single chain link in 7.5 cm distance. All edges are perfectly smooth. Each cuff is locked by an allen screw, a matching allen key is included.