Primary Arms Absolute Cowitness 30mm Single Ring Mount - PAAC30 USE: Locates your red dot scope or magnifier with a 30mm mounting tube at the absolute cowitness height. SIZE: Single mount ring for use with a 30mm mounting tube. DURABLE AND LIGHTWEIGHT: Constructed of anodized aluminum and weighing only 3.6 ounces. 1-YEAR WARRANTY: If a defect due to materials, workmanship, or normal wear and tear has caused your product to malfunction, Primary Arms will either repair or replace.