It has accessorie holes in top of scope caps for installing extra accessories these are very expensive scope base very sturdy and retain zero when taken off and installed back on rifle. I used this mount shooting long range with my 50 BMG. The item "34mm one piece scope mount 20 MOA heavy duty all steel ERA Tactical brand" is in sale since Wednesday, February 24, 2021.This item is in the category "Sporting Goods\Hunting\Scopes, Optics & Lasers\Scope Mounts & Accessories". The seller is "shawneeshooter" and is located in Meeker, Oklahoma. This item can be shipped to United States.