This is a karabiner that locks securely but at the same time supports the motion of the lure. Additionally, the Sure-Fit has a unique, centred guiding stub that ensures line and leader are always straight during casting and which prevents unintended opening of the safety closure as well as ensuring your lure retrieves in a straight line.   Size: 2 Strength: 14kg Size: 1 Strength: 20kg Size: 1/0 Strength: 27kg