VERY100 Tactical M10 QD-L Scope Mount Integrated Anti Cant Scope Level Fit 20mm Rail Fits 1" and 30mm scope tube.Integrated Anti Cant Scope Level Length:109mm (4.29").Hard coat matte finish Spring-loaded pivoting locking clamp Fits 20mm Picatinny/Weaver/MIL-STD rail CNC machined from durable 7075 aircraft grade aluminum