Daniel Defense has expanded its line of optics mounts to offer secure mounting for the most standard size scopes. It features Daniel's patented Rock & Lock mounting technology for easy installation and removal with Torx Plus fasteners at the base and rings. The mount is precision machined from 6061-T6 aluminum with hard coat anodizing finish. This model is compatible with your Aimpoint E3, has a black finish and one (1) 30mm ring.