I designed these titanium keychain beads to attach lanyards to a keyring or keychain. You can thread paracord into the smaller hole at one end of the lanyard bead and out through the larger hole. A knot can then be tied, which can slip through the larger hole but be held in place inside the ti bead. The smaller diameter hole prevents the knot from slipping out. These make very clean lanyards for keychains and knives and can also be used as zipper pulls.Dimensions: 21mm x 13mm, 6mm and 9mm holes (one on each end), 4mm hole on sides for keyring attachment, 2mm thick walls, weight: .22 oz.