-Both ends of the standoff are covered with knurl, and there are many colors to choose from, practical and beautiful. -These standoff are made of high quality aluminum alloy with high strength.Suitable for aircraft, multi-rotor, drone, helicopter, etc. -Each set including 10 pcs standoff to meet quantity needs, the standoff tapping depth of both ends is about 8mm. -Anodized processing for better corrosion and rust resistance. -If for any reason you are unhappy with any product, please do not hesitate to contact us. We will do our very best to solve your problem quickly and efficiently!