Machined parts allow you to adjust your stock for a perfect fit. Adjustable up to a 1� vertical drop, 22 degrees of diagonal cant, (right or left) and 5/16� of horizontal offset. Easy installation. Finding the perfect fit is almost like cheating -- a perfect fit will make you a better shooter, reducing felt recoil, flinches and getting you on target faster. Two plates slide together - each is 0.145" thick for a total thickness of 0.290 or approximately 1/3".