Product information:
The screw is Taiwan YFS Fangsheng 12.9 grade hexagon socket, and the screw is made of stainless steel;
Style:
1. Flat head (Silver/black/gold three colors optional) adjustable tightening length (between 18-24mm)
2. Round head (Silver/black/gold three colors optional) adjustable tightening length (between 18-24mm)
Note that this product has only one specification, but the nut color is different. The screw length is 13mm, the diameter is 4.9mm, and the screw hole is M4
The above specifications and options are forced to be added by the system, which is meaningless!
Nut diameter is about 7.5mm, where flat head is M4 * 8, round head is M4 * 6 use L2.5 six-angle wrench
It should be noted that when the screw is used for the first time, it will be relatively stuck (because of the relationship between the plating layer). You need to use a wrench to twist it back and forth several times to make it smooth.

Screw * 1