This is a box of isolation , which are made of materials, and can be used for a long time. Standard hexagonal shape, high hardness, no deformation, anti-scratch, smooth surface, no burr, are clear and not slippery. These isolated are convenient to carry and install. Features -Color: Golden. -Material: Brass. - Size: 2.30X0.50X0.50cm/0.90X0.20X0.20in - material bolts and nuts screws are and can be used for a long time. - Standard hexagonal shape, high hardness, no deformation, anti-scratch, smooth surface, no burr, are clear and not slippery. - The thread is neat and clear, and is even and not easy to slip. - Very convenient to use without burrs, and will not hurt your hands. - These isolation are convenient to carry and install. Package list: Single-Head Studs Brass 20 x Nuts 20 x Pan Head Screws