Sister Clip. Pack of 2 (sisters) Sister clips are often used in pairs with one clipping into another hence the name "sister," and they are designed to provide a secure attachment point while allowing for easy adjustment and removal of the hardware they hold. They are commonly used in sail control systems to fine-tune sail trim quickly attaching and detaching ropes. Essential somewhere on all dinghies and smaller yachts. Made from Marine Grade 316 stainless steel. Length 37.0 mm B. L. 250 kg Weight 10 g