Vortex(R) Precision Diving Board Mounts are machined with certified USA 7075 T6 Billet aluminum, held to an extremely tight tolerance of .0005" and anodized with Type III hardcoat. This diving board mount provides the perfect mounting height and positioning for the Vortex(R) Impact(R) 4000 Rail Mounted Ballistic Laser Rangefinder, red dots, and other picatinny mounted accessories. Compatible with Precision Matched Rings and Precision Extended Cantilever Mounts.