Made of high quality hard plastic, lightweight, sturdy, self-locking, quick release, UV resistant D-shaped carabiner. The carabiners are very suitable for home use, outdoor hiking, fishing, camping, bags, etc. The spring lock and textured handle design can be used with wet hands or gloves. Medium size, not too big or too small. The carabiner features a spring loaded lock that allows for quick and secure attachment to various attachment points. Works smoothly. Not suitable for climbing or as a safety chain!