Feature A 100% avoid CANT A 30mm Diameter ACD Mount A Air Bubble Level A Easy to Use A Designed for Real Firearms A Full Metal A Light & Compact Picture Specification A Diameter:30mm A Length:49mm(1.9 inch) A Width:8mm(0.3 inch) A Weigth:14g(0.5 ounce) A Finish:Black matte A Anti Cant Device mount designed for real fire arms A Air bubble floating to indicate level situation A High quality 6063 T6 aircraft grade aluminum alloy A Including items: hex key