●The size of the clip lock is approx. 9~13mm The hole size is approx. 3~3.5mm, excellent size for jewelry making. ●The package consists of 20 different types of clip locks and 20 O-rings with silicone plugs that meet your different needs. ●The antique silver finish base is not threaded to easily slide onto various European bracelets and necklaces. ●Use this clip lock at the end of your bracelets and necklaces to add an extra sparkle to your jewellery projects. ●Compatible with most European style chains: these beads are compatible with standard European style bracelets and necklaces.