This pair of rings is compatible with 1? maintubes and can be mounted on Weaver-style rails. The extension on one ring allows users to adjust the mounting positon of the optic forward or backward to achieve an optimal eye relief. The saddle is made of weight-reducing aluminum while the strap is crafted from steel.

Features:For 1" maintubes;One ring with extension;Offset ring allows adjustments;Can be used to get ideal eye relief;Height - saddle: 0.33"/ 8.4mm