Description:Made of aluminum alloy, corrosion proof and durable.Straight hollow cylinder design, lightweight, strong hardness, secure.It can be used for connecting rod, pulling rod or the top column, play the role of connecting or extending nut.Fit for RC Airplane,FPV Quadcopter,CNC,etc. Specifications:Material: Aluminum AlloyModel : M3x12Length: 12mmOuter diameter: 5mmInner diameter : 3mmPackage Include:10pcs x M3 Round Aluminum Standoff Column Spacer