Features The axle sleeve can use an aluminium tube with an inner diameter of 10 mm and an outer diameter of 12 mm to give the chassis structural support with stable performance and strong practicality. The aluminum round tube can be used as a shaft in a rotating assembly or as a sleeve on a tube with an outer diameter of 10mm, I believe it will make your life more convenient. The aluminium tube is lightweight and portable, not easy to corrode and deform after prolonged use, exquisite workmanship, smooth and delicate appearance, durable and durable. The 150mm aluminium tube kit contains 5 aluminium tubes that are easy to install and disassemble, with strong practicality, 100% new, high-quality, reliable and safe quality. These aluminium tubes have a standard size and a sufficient quantity. They are commonly used parts in the field of robotics. You can perfectly replace old or bad ones. They have a wide range of functions and obvious effects. Specification: Item type: aluminium tube. Model: 6100-1012-0150. Material: aluminium. Outer diameter: approx. 12 mm / 0.5 inches. Inner diameter: approx. 10mm Length: Approx. 150 mm / 5.9 inches. Application: in the field of robotics, it can be used for structural support of the chassis Package list: 5 x aluminium tubes Package List 5 x Aluminum Tube