Marine grade stainless steel fixed bail (eye) snap shackles are used where there is no twist factor in the line attached to the ball, such as the backstay, boom, pennants, genoas, etc. These these drop forged electro-polished snap shackles combine strength with good looks and functionality. A great price for an easy to release stainless steel snap shackle. A snap shackle is a fast action fastener which can be implemented single handedly. It uses a spring activated locking mechanism to close a hinged shackle, and can be unfastened under load. For this reason snap shackles are not as secure as any other forms of shackle, but are useful when a shackle must be moved or replaced often.