Custom Bracket's SP-521 Lens Mount Screw for GLM Plates is a captive 3/8"-16 mounting screw for the GLM 5.5, 6.5 and 8.5 lens plates by Custom Brackets. It is made from lightweight aluminum, and is turned by using a slotted screwdriver, or the built-in D-Clip.
| Material of Construction | Aluminum |
| Thread Size | 3/8"-16 |