it is light weight and .
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.
colour:Silver

Material:metal
size:for D-ring Screws:3/8 inch
Total length including base: 16.2mm(0.64 inch).
Total shaft length: 13mm(0.51 inch).
Threaded part of the shaft: 7mm (0.27 inch).
No thread part of shaft:6mm(0.24inch).

Package Contents:
4 x Fixing screw adapter