A great way to provide a mounting point to practically anything, the RAM Wedge Mount expands to accommodate holes from 7/8" - 1" in diameter and locks tight for a secure hold. Simply slide the wedge into the round opening of your rod holder base and tighten the screw. Mounts, supports, and positions anything from RAM Rod holders. Compatible with RAM Fish Rod and Tube Rod Holder bases, Fish-On bases, and Atwood bases. 1.5" rubber ball size. High-strength plastic construction. Black.