The quick link has a body defining an open link with two opposite ends. The body comprises a straight portion separating two curved portions. A locking ring is fitted rotating and sliding with respect to the body with a closed position closing the link and an open position where the quick link is open. A shutter is fitted removable with respect to the body. The shutter defines an attachment means fixing the shutter to the straight portion and a blocking system fixing the shutter to the locking ring. The attachment means and blocking system are formed by a ring or a hook. The attachment means and blocking system allow rotation of the shutter with respect to the body when the locking ring is in the open position and prevent rotation of the shutter when the locking ring is in the closed position.

The quick link has a body defining an open link with two opposite ends. The body comprises a straight portion separating two curved portions. A locking ring is fitted rotating and sliding with respect to the body with a closed position closing the link and an open position where the quick link is open. A shutter is fitted removable with respect to the body. The shutter defines an attachment means fixing the shutter to the straight portion and a blocking system fixing the shutter to the locking ring. The attachment means and blocking system are formed by a ring or a hook. The attachment means and blocking system allow rotation of the shutter with respect to the body when the locking ring is in the open position and prevent rotation of the shutter when the locking ring is in the closed position.

A fastener for releasably securing a member including a body including a shank and a recess, the recess configured for receiving the member. A gate is mounted to slide axially on the shank between a closed position closing a mouth of the recess for retaining the member, and an open position. Resilient means engages the gate and the shank to urge the gate to the closed position, and latches are mounted on opposing sides of the gate, wherein each latch is self-closing and engages the body for holding the gate in the closed position providing an auto-locking fastener that, for greater security, requires three independent actions for release.