1.Smooth Swivel Flexibility DesignOur keychain hooks are equipped with full 360 degree swivel,which helps the lobster claw clasp not be tangled,so you can rotate it in any direction and ensure your hanging items won't fall out from it. 2.Durable and Environmental Friendly MaterialsBoth the lanyard snap hooks and key rings are made of zinc alloy material, lead-free, durable and robust,which makes sure a longer use lifetime for your keychain and art DIY works. And a great gift choice for your friends and families. 3.Suitable Size & Enough QuantityThe swivel hook length: 3.5cm/1.38inches,width: 1.4cm/0.6inch, D ring diameter: 0.9cm/0.3inch; and key ring outer diameter: 2.5cm/1 inch, inner diameter: 2cm/0.8inch. Besides the package includes 50 pcs lobster clasps and 50 pcs keychain rings, its great enough set for you to make kinds of DIY crafts as you like. 4.Wonderful & Wide ApplicationsThese swivel snap hooks can be used for making lanyards, keychains, handbag, purse, backpacks, straps, wristlets, handmade puppy collars and other DIY crafts.