The angle adjustment is a locking knob you unlock the mount then adjust with the lower knob, each tactical click is 5 MOA or Mills i have the mount in MOA it is available in both. after dialing in how many MOA you want you relock the knob and fine adjust with your scope the wear and tear saved on your scope is huge.it returns to zero every time to within 1 thousandths it is repeatable and the rings only fit one way you can not swap the back ring for the front etc it is truly a work of art.......