Primary Arms Micro Dot Base Mount/Riser - 1.5" Center Height LHM-2AC HEIGHT: This micro dot riser has an absolute mount height of 1.50 inches. RUGGED AND DURABLE: Constructed of anodized aluminum. COMPATIBILITY: Aimpoint Micro T1 / H1 Compatible. LIGHT WEIGHT DESIGN: Constructed of lightweight aluminum weighing 0.15 lb. 3-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.