This pair of rings are compatible with 1? maintubes for mounting on Weaver-style rails. The extension on one ring allows users to adjust the mounting position of the optic forward or backward to achieve optimal eye relief. The saddle is made of aluminum while the strap is steel.

Features:For 1" maintubes;One ring with extension;Offset ring allows adjustments;Compatible with Weaver rails;Saddle height: 0.56"/ 14.2 mm