Made of durable eco-friendly nylon PA66 which has the stable and long-lasting performance of acid resistant, alkali resistant, insulation and anti-signal inteference. With smooth surface, clean and clear thread, they look very nice, quite convenient and practical to use. There are different sizes available from which you can choose proper one for your building needs. Ideal for mounting between PCB circuit boards and machine boards, working great for creating thermal channels between chips, or creating multistory 'nerd' arrays of home made circuit boards. Widely used in machinery industry, electronic industry, testing equipment, electric equipment, medical equipment, communications, automotive, engineering machinery, electric power and other fields., Weight: 0.0220462262 Pounds, Manufacturer: FTVOGUE