This is a screw nut set assortment kit that includes a set of 180pcs allen screws and nuts in types . Those screws and nuts made of copper, have a thin that digs into the surface for a on a wide range of surfaces. Features - Color: As shown. - Material: Copper. - Size: 0.6x0.6x2cm. Category: Bolts Head type: Hexagon Surface treatment: untreated Material grade: copper and copper alloy. - 180 x Brass standoff/ nut assortment. - All products are made of copper. - Package Includes: allen screws and nuts. - Easy to install and to use. - Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 10 x Brass male-female standoff 6 mm + 6 mm 10 x Brass male-female standoff 10 mm + 6 mm 10 x Brass male-female standoff 15 mm + 6 mm 10 x Brass male-female standoff 20 mm + 6 mm 10 x Brass female to female 6 mm 10 x Brass female to female 10 mm 10 x Brass female to female 15 mm 10 x Brass female to female 20 mm Stainless steel screws 6 mm Stainless steel nuts