1.2pcs Aluminum Column, M3 Female Thread,  15mm Total Length, 5.5mm Hex Ends. 
2.This is a necessary for your DIY multicopter.
3.It is very light and hard enough, so that it is easy to carry and with good performance.
4.Fit for Quadcopter, Hexacopter, Octocopter, Multicopter.

• Country of Manufacture: CHINA; Material: Aluminum
• Net Weight: 2g; Package Content: 2 x Hex Hexagonal Aluminum Column
• Main Color: Black; Total Length: 15mm/ 0.59"
• Female Thread Dia: M3; Dual Ends Hex Size: 5.5mm/ 0.21"
• Pillar Shaft Dia: 5.2mm/ 0.20"

Country of Manufacture: CHINA; Material: Aluminumuxcell