Huge size - 5.04 inch long. Very sturdy, strong construction. Safe - Hard to open for children. Rust resistance - made of 3.3mm-diameter stainless steel. Mainly used for heavy duty laundry like canvas, leather, vinyl and sweater. Or hanging stuffs. Ideal for fastening coarse weaved strong materials together, like horse blanket. You can use it as a "catch all" key chain- it holds house keys, car keys and other crafts. Once they're in your hand, you will find plenty of outdoor uses for them.