Description it is light weight and . D-ring with flat screwdriver slot, can drive it by coin. You dont 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: 2* Fixing screw adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.