Feature A Made of Steel A 25.4mm 1 Inch A Installation on Side A Replica A Heavy Duty A WW2 Mosin Nagant 91/30 PU Scope Mount A Designed for Real Fire Caliber Picture Specification A Diameter:25.4mm 1 inch A Mount Length:112mm (4.3") A Installation:On side A Weight (net):445g(15.7oz) A Material:45# Steel A 100% replica designed for real fire caliber A Gap length between rings: 50mm 2.0" A Shock proof (1000g) A Durable, inexpensive, precision