Combination Lock Unisex Wrist and Ankle CuffsSmallOverall Length 210mmDiameter Inner 42-60mmThickness 11mmMediumOverall Length 210mmDiameter Inner 45-70mmThickness 11mmLargeOverall Length 510mmDiameter Inner 55-80mmThickness 12mmXLargeOverall Length 600mmDiameter Inner 67-90mmThickness 12mm