The STEEL-LOK Quick Release Steel Rings are available for 30mm and 1“ scope diameter in three different heights and fit for Weaver/Picantinny. The strong steel construction and field tested design provides precise fitting and re-fitting. Made from solid steel. Features: • Weaver / Picatinny Design • Field Tested Design • Matte Black • Quick Release • Machined from Solid Steel • Precise and Reliable • Strong Steel Construction • Fitted with thumb operated quick detachable levers for easy removal and precise re-fitting to original point-of -imp Nikko Stirling Mount