These standoffs are made of durable and long-lasting eco-friendly Nylon PA66 which has the characteristics of insulation, Non-Magnetic,thermal insulation,corrosion resistance, etc, and perfectly suitable for mounting between PCB circuit boards and machine boards and widely applied to the industries of communication, electroplating, medical device, office equipment, electronics, etc. Clean pieces, no excess molding materials or anything to trim, snug fit, this is really a ideal set for your home projects! What are you waiting for? Get one set and make your life easier and more convenient! Feature: 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. They do not skid easily with appropriate use. Specification: Material: Nylon Material Grade: PA66 eco-friendly Nylon Color: Black Thread Type: M3 Shape: Hexagonal Working Temperature: -20-120 Fire Proof Requirement: 94-V2 Standoff Length: 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 25mm(optional) Package Weight: 15-60g Quantity: 100pcs / bag Package Included: 1 x bag of standoffs