8x4mm Silver-Toned Aluminum Barrel Screw Clasps For Jewelry Making.. Barrel Clasps Are Great For Finishing The Ends Of Necklaces. Adds a Refined Appeal To Jewelry. Easier To Open & Close Than Spring Rings or Lobster Claws. Tighten & Loosen With Screw Action. Already Designed & Ready To Be Finished Into a Necklace, Bracelet, Ankle Bracelet, or Anything Sort Of Fashion Accessory!. String The Ends Into The Barrel, Then Finish With Knots or Crimps. Clasp Dimensions Measure Approximately: 5/16 Inch (8mm) Long x 3/16 Inch (4mm) Thick. 0.8mm Hole. Approximate Count per Bag: 50 . Durable Silver-Tone Finish Offering a Precious Metal Look That's as Affordable as It Is Attractive