Description The screws are made of carbon steel material, high hardness and with inner threaded design, being smooth and safe, sturdy and, to give good luster for better using. Non-rusting, not easy to rust in moisture environment,, can be widely used for leather handicrafts decoration, bookbinding, document, book, album, DIY crafts and more. Features - Color: silver. - Material: carbon steel. - Size: 0.90X0.50X0.40cm/ 0.35X0.20X0.16inch. - Specification: M4x4, M4x5, M5x5, M5x6, M5x8, M5x10, M5x12, M5x15, M5x18. - Made of carbon steel material,, anti-rust, safe and for long time to use. - These screws can be used for leather handicrafts decoration, bookbinding, document, book, album, DIY crafts and more. - Easy to bind, install and remove, can use repeatedly, good tightness, you can use rest assured. - Perfectly smooth, hard and thick, sturdy inner threaded design, not easy to fall off. - Delicately designed head, can be install and remove with standard screwdriver easily repeatedly. Made of carbon steel material,, anti-rust, safe and for long time to use. These screws can be used for leather handicrafts decoration, bookbinding, document, book, album, DIY crafts and more. Easy to bind, install and remove, can use repeatedly, good tightness, you can use rest assured. Perfectly smooth, hard and thick, sturdy inner threaded design, not easy to fall off. Delicately designed head, can be install and remove with standard screwdriver easily repeatedly.