DIYers can assemble your own multi-rotor aircrafts with this arm clamps, it suit for not only small size entertainment purpose multi-rotor, but also large scale commercial aerial photography multi-rotor aircrafts. 

There are two series for the aluminum clamps, normal series and CNC super light series, the CNC series usually are 2-3g lighter compare to the same size of normal series.  

D12mm Multi-rotor Arm Clamps/Tube Clamps 

Suit for tube diameter: 12mm
Screw diameter: Φ2.5mm (12.9 class high strength)
Screw length: 21mm  (suit for 1.5-2mm thick carbon plate, 2mm recommended)
Screw hole spacing: 16.5mm ±0.2
Weight: 4.5g  each (including screw and nut)

Includes:
1 x tube clamp (including screws)

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