These swivels prevent twisting of anchor lines or rope. Also suitable for gym equipment due to their robust manufacture. Available in A4 marine grade stainless, making them suitable for all harsh environments. Available in 5mm, 6mm, 8mm, 10mm, 13mm, 16mm and 19mm sizes, where size represent the diameter D. The smallest overall length is approx 6cm, the longest is just over 20cm.