National Hardware's 6" Black Interlocking Spring Snap allows quick attachments of all types of material and equipment. Steel body and spring construction provide maximum durability. Designed to install and remove quickly and repeatedly. For quick repeated attachments in a wide variety of applications. Snap links require no tools for assembly, simply push the spring lock onto the desired attachment. Medium Duty Rating with 200 lbs. Safe Working Load, always follow safe working load (SWL) limits included on packaging. National Hardware's Lifespan Limited Lifetime Warranty.