Feature A 100% avoid CANT A 40mm 1.6" Diameter A On-side Air Bubble LevelEasy to Use A Designed for Real Fire Arms A Full Metal A Light & Compact Picture Specification A Diameter:40mm(1.6 inch) A Length:65mm (2.6 inch) A Width:9mm (0.35 inch) A Weight:28g (1oz) A Finish:Black matte A Anti Cant Device mount designed for real fire arms or any 40mm diameter object A Air bubble floating to indicate level situation A High quality 6063 T6 aircraft grade aluminum alloy A Including items: hex key