This binding screw is made of , which can withstand long-lasting use. Features the stainless steel material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. Features -Color:Black -Material:Stainless steel -Size:2.70X1.20X1.20cm/1.06X0.47X0.47in -Size:1.50X1.20X1.20cm/0.59X0.47X0.47in - Made of stainless steel material, coating, high hardness. Main functions: combination, connection, fixation, wear resistance. - Easy installation: make a hole 0.5-1mm larger than the diameter of the female rod, place the screws and nuts on both sides of the locked object, and choose the appropriate to lock. - Suitable for all kinds of DIY, leather crafts, clothing making, or as a fastener to connect two objects. Such as thin photo albums, leather bags, wooden board connectors, etc. - Leather fasteners are suitable for clamping files, books, scrapbooks, photo albums, etc. - Easy to install and simple to use, not easy to rust and deform, high strength, excellent and durable. Package list: 5 x sets of binding screws