7075-T6 aluminum and Type III hard coat anodized black.
FAST LPVO Mount Offset Optic Base RMR&T1&T2 Attaches to the front or rear mounting holes of the FAST LPVO Scopes Mounts. In conjunction with the FAST LPVO Offset Optical Adapter Plate, it provides a mount for attaching the advanced mini red dot sight directly to the scopes mounts. The offset optical mount places the mini red dot sight at a 35 degree offset from the barrel for faster changeovers. When used with an optical adapter plate, the mechanical centerline of the mini red dot will be 2.05" above the rail
installation steps:

1.Put the long sight on the bracket

2.Put in the configuration screws and tighten the screws

3.Install the bracket into the guide rail as shown in the figure

4.Finally tighten the screws to secure the product and complete the installation