The HHA OPTIMIZER LITE X 5019 is a left-hand adjustable sight equipped with a 1 5/8" housing and a .019 fiber optic pin. It features R.D.S. technology that provides yardage tape in 5-yard increments with a quick turn of the dial, enhancing user convenience during adjustments.Key FeaturesMaterial: Constructed from machined aluminum for durability.Weight: Weighs 8 oz for lightweight handling.Included Fiber Optic: Comes with 3 feet of .019 fiber optic for improved visibility.Lens Compatibility: Accepts lens kit B and Blue Burst light for enhanced performance.