Generic Silvery 0.62" Inside Diameter Oval Ring Lobster Clasp Claw Swivel for Strap Dog Collar Pack of 4 Inside swivel tail Oval ring diameter:0.62". Lobster clasp total Length:3". Snap opening mouth maximum size about:0.42". Lobster all kinds of purse or bag strap connector. Full 360 degree swivel eye helps prevent tangles.