The SSK TSOB Thompson Center Encore/Contender Scope Ring fits SSK-50 firearm platforms Compatible with Contender 0.810" diameter barrel and 6 screw mount (6) 6-48x3/16 SHCS screws included Made from 2024-T4 bar stock, not extrusion Matte Black hardcoat anodize Picatinny spacing with 10 MOA Lightened base. Note: This ships as only 1 single ring. Not as a pair.