Specification:

Brand: HSKRC
Item Name: 5.5mm to 20mm 16mm Adapter for Mounting Flight Controller

Quantity: 1 PC

Material: carbon fiber
Weight: 0.72g (single board) 
board size: 30*30mm 
Board thickness: 1mm 

Notice:  Carbon Fiber is easy to conduct electricity, pay attention to isolation and insulation!

Package Included:
1x Adapter
8x M2 nylon nut
4x M2x6 Screws
4x M2x8 Screws