5mm once squeezed. These Rhodium crimp covers are used to cover crimps at the end of your necklaces or bracelets. Also used for covering knots. Before use, they look like little pac-man. Bite them over the crimp or knot and use your pliers to close them slowly adjusting pressure where needed. These will give the apperance of a bead at the end instead of having an ugly crimp or knot showing.