TAC Vector Optics Tactical Mark 30mm High Profile 31mm 1.2 Inch from Base Picatinny Weaver Mount Ring Bracket 21mm Base Black Matte;

Ring Length: 16mm (0.63 inch)
Ring Dia.:30mm
Height: 31mm (from base to ring center)
Weight: 130g (4.6oz)
Main Material:6061-T6 aluminum alloy
Finish:Black matte
Easy and quick installation
Fit on 21mm picatinny and weaver rail
Designed for real firearms
With 1 pc wrench, nice plastic box package