Specification Brand : Tyenaza BulletPoint1 : The kit contains 5 replaceable aluminum tubes, which are commonly used parts in the robotics field. BulletPoint2 : The inner diameter is 10mm and the outer diameter is 12mm, which can be used to add structural support to the chassis. BulletPoint3 : Can be used as a shaft in a rotating assembly, or as a sleeve with an outer diameter of 10mm. BulletPoint4 : The aluminum tube with circular hollow structure design is easy to install and disassemble, and it has strong practicability. BulletPoint5 : Made of aluminum, light and convenient, easy to install and replace, not easy to corrode after long time use. ItemName : Tyenaza 5Pcs Aluminum Tube Shaft Pipe Fittings Replacement Industrial Robot Parts 200mm 6100‑1012‑0200 ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 30 centimeters ItemPackageDimensions_Width : 20 centimeters ItemTypeKeyword : robot-accessories Manufacturer : Tyenaza ModelNumber : Tyenazabtf0xe5y3c PartNumber : Tyenazabtf0xe5y3c ProductDescription : Item Type: Aluminum Tube Model: 6100-1012-0200 Material: Aluminum Outer Diameter: Approx. 12mm / 0.5in Inner Diameter: Approx. 10mm / 0.4in Length: Approx. 200mm / 7.9in Application: In the field of robotics, it can be used to add structural support to the chassis