Features 1、These four-sided 16 mm aluminum beams are the structural building blocks for creating robots. 2、Available in seven lengths to provide flexible building options 3、The hole distance is 8mm, easy and convenient to connect. 4、High quality aluminum can ensure the durability and stability of the product. 5、There are 2pcs aluminum square beam for using, perfect replacement for the old one. Specification Features: 1. These four-sided 16 mm aluminum beams are the structural building blocks for creating robots. 3. The hole distance is 8mm, easy and convenient to connect. 4. High quality aluminum can ensure the durability and stability of the product. 5. There are 2pcs aluminum square beam for using, perfect replacement for the old one. Specification: Condition: 100% Brand new Item Type: Square Beam Material: 7005 Aluminum Large Hole Diameter: Approx. 8.1mm / 0.3in Small Hole Diameter: Approx. 3.8mm / 0.1in Size: Approx. 16 x 16 x 240mm / 0.6 x 0.6 x 9.4in Weight: Approx. 77g / 2.7oz Package List: 2Pcs Square Beam Package List