These screw-type clasps are easy to twist apart.They are tiny,but it's not difficult to get screw them together.The middle holes are big enough to be easy to thread. Sturdy.The barrel not easy to bend out of shape when tying threads on.Nicely for slimmer line bracelets and anklets.A great way to secure bracelets and necklaces. Secure.The barrel screw clasps on stiff is very smoothly.Screws together for a strong hold.They are uncomplicated and easy to use.More dependable than magnetic closures. Easy to use:The two ends of the thread are tied through two holes,and the two sides are fixed together by tightening the screws,prevent the loss of jewelry. Easy enough to use,and they are lightness and neater on your necklaces.Won't show clumsy.It can be used to repair your broken jewelry or DIY to make homemade jewelry,necklaces,bracelets or other handicrafts. Material:Copper Quantity:60pieces(20pieces golden screw clasp,20pieces silver screw clasp，20pieces steel screw clasp) Size:Length:8mm.Diameter:4mm.Hole diameter:1mm The barrel screw clasps are easy to twist apart.Sturdy and durable,not easy to rust and long-lasting.Screws together for a strong hold.It can be used to repair your broken jewelry or DIY to make homemade jewelry,necklaces,bracelets or other handicrafts.