1Made of durable eco-friendly nylon PA66 which has the stable and long-lasting performance of acid resistant, alkali resistant, insulation and anti-signal inteference 2With smooth surface, clean and clear thread, they look very nice, quite convenient and practical to use 3There are 4 different sets available for your building needs including a variety of male or female standoffs, nuts and screws 4Ideal 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 5They do not skid easily with appropriate use