Fits 3.5x35 4x32 5.5x50 ACOG 1x42 Reflex (with ACOG bases) and 1-6x24 VCOG. - Mounts optic to picatinny rail with two thumbscrews. - Weight = 4.0 oz. - Overall Length = 3.50 in. - Height of Mount to Optical Axis: - 3.5x35 4x32 and 5.5x50 ACOG = 1.535 in. - 1x42 Reflex (with ACOG Bases) = 1.506 in. - 1-6x24 VCOG = 1.535 in.