3.98 inches / 101.2 mm. 19.9 ft - 4.4 ft. Red dot , 6 level each. 610g / 21.52 oz. International buyers please note: a.ESTABLISHED in 2009, Marcool Optical Instrument Co Ltd. Specialized in managing the "MARCOOL" brand and engaged in the designing. Red dot and other optical instruments. MARCOOL has always been kept ahead by its advanced instrument. Our marketing networks are widely distributed in Europe. North America, South Africa and Asia and so on. MARCOOL will keep strive in establishing a well-known brand around the world!