Feature A 100% avoid CANT A 30mm Diameter A Air Bubble Level A Tactical Style A Easy to Use A Designed for Real Firearms A Full Metal A Light Weight Picture Specification A Diameter:30mm A Length:149mm(5.9 inch) A Install Length:59mm(2.3", two big bolts distance) A Height:36mm(1.4"from bottom to ring center) A Weigth:167g(5.9 ounce) A Finish:Black matte A Anti Cant Device mount designed for real fire arms A One piece mount design A Bap between two rings 59mm (2.3 inch) A High quality 6063 T6 aircraft grade aluminum alloy A Including items: hex key