NEC38 and NEC50 fixing kit for framing in aluminium stretchers

This kit is used during framing (traditional frames and shadow box frames) of NEC38 or NEC50 aluminium stretchers.
Consisting of 10 M4 insert nuts and 10 M4x8 hexagon socket head stainless steel screws, this kit is to be used in addition to the fixing plates to connect the stretcher to the frame.
The nuts, which can be inserted, are spring loaded to hold them in place in any position.