Vortex Precision Diving Board mounts are machined with certified USA 7075-T6 billet aluminum, beld 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 Impact 4000 rail mounted ballistic laser rangefinder, red dots, and other picatinny mounted accessories. Specifications: Tube Size: 34mm Mount Type: Picatinny Height: 1.61" Weight: 2.6oz