It is light and durable
D-ring with flat head screwdriver slot, can drive it by coin
You don't need to worry there is no spanner
The screw could be used with tripods, monopods, telescopes, ball heads, lens collars, lens plates etc.
Specification:
Material: metal
D-ring bolt: 3/8 inch
Total length including base: 16.2 mm (0.64 inch)
Overall shaft length: 13 mm (0.51 inch)
The threaded part of the shaft: 7 mm (0.27 inch)
Unthreaded shaft components: 6 mm (0.24 inch)