Tianbang Gun Black 0.5" Inside Dia D Ring Lobster Clasp Claw Swivel Eye Hole for Strap Pack of 15 Swivel tail D ring inside diameter:0.5". Lobster clasp total Length:1.6". Snap opening mouth maximum size about:0.2". Lobster all kinds of purse or bag strap connector. Full 360 degree swivel eye helps prevent tangles.