National Hardware's 5/16" x 2-3/8" 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. Safe Working Load is 165 lbs. per Spring Snap. For quick repeated attachments in a wide variety of applications. Medium Rating Duty with 5/16" opening, always follow safe working load (SWL) limits included on packaging. National Hardware's Lifespan Limited Lifetime Warranty.