Tianbang Bronze 0.5" Inside Diameter D Ring Lobster Clasp Claw Swivel for Strap Pack of 20 Swivel tail D ring inside diameter:0.5". Lobster clasp total Length:1.5". Snap opening mouth maximum size about:0.26". Lobster all kinds of purse or bag strap connector. Full 360 degree swivel eye helps prevent tangles.