Feature A 100% avoid CANT A 35mm Diameter A Upper Ring with Locak feature A Easy to Use A Designed for Real Firearms A Full Metal Picture Specification A 100% avoid CANT A Install on 35mm riflescope A Ring Width: 14mm (0.55 inch) A Weight (net): 45g (1.6 ounce) A Material:6063-T3 aluminum in black matte A Upper ring is with lock feature. When install just press onto the scope tube A Shock proof that designed for real firearms A Can mount either side of the scope (bubble on the top) A Fitting:instruction, hex key