Size: about 4mm wide, 16mm long, 4mm thick, hole: 2x1.5mm,10pcs in total;screw clasps, essential for jewelry assembly. Easy to UseThese Screw Clasps can be operated without assistance. Simply turn and tighten the screws on both sides. Knurling on the surface provides better grip. Quality Material:These clasps are made of 304 stainless steel, hand the high quality material makes these clasps hard, not easy to break, not easy tarnis, for long-lasting wear. Versatile Design: Each connector for jewelry making is equipped with an open ring on both ends, facilitating the connection of various jewelry pieces like necklaces and bracelets. Widely used: screw connector fixings are a good choice for DIY jewellery making projects, such as necklaces, anklets, bracelets. Also ideal for fixing necklaces or other crafts.