Feature A 139mm 5.5" Length A w/ 25.4mm 1" Adapater A 29mm 1.15" from Bottom to Ring Center A 11mm Dovetail A Detachable 4 Slots Picatinny Rail A Come With Vertical Stop Pins Picture Specification A Dia: 30mm with 1" adapter A Overall Length: 139mm / 5.5" A Mount Length: 26mm / 1" A Ring Width: 21mm / 0.8" A Rings Gap: 63mm / 2.5" A Height: 29mm (1.15"), bottom to center A Weight(net): 125g / 4.4oz A Finish: Black matte A Material: 6063-T6 A Mount: 11mm dovetail A Designed for real fire arms or air gun A Four screws per ring A Spare rail can be installed on top or two sides A 30mm one piece mount skeletonized extra light A Included items: hex key, spare 4 slots picatinny rail, 25.4mm 1" adapter