SIZE&QUANTITY: It is about about 3mm wide, 6mm long, hole: 1.6mm, pin: 1mm. The package includes 200Pcs, enough for your different requirements.MATERIAL - Made of Iron which is non-fading, does not readily corrode, rust and water resistant for marine, bath and outdoor applications.JEWELRY MAKING: Each mini screw comes with a circular eye opening at the top, so you can slide in a string for a beautifully luxurious new necklace or bracelet.IMPROVE YOUR DIY SKILLS: You can learn simple and exciting techniques to make jewelry just like you see in department stores, affordable way for DIY to get great style.DIY YOUR UNIQUE GIFT: You can use these Bails with the satin cord, leather, suede lace or other materials to make a beautiful necklace or bracelet, then give it to your families, lovers, friends or neighbors as an unique handmade gift, they will love it.