The Morgan Premium Recoil Pad uses CNC Machined aluminum mounting plates. The #15 has the Straight (flat) shoulder pad that provides a comfortable surface on the shooter's shoulder. It uses a Butt Plate that is meant to be trimmed to match the stock by the installer. The mounting holes in the Butt Plate are spaced 3 3/16 inches apart on center, but the lower hole is slotted 3/8 inches long for increased flexibility. The recoil pad adjusts up and down (11/16 inch rise, 13/16 inch drop). By adjusting the amount of squeeze on the recoil absorbing sponge rubber, the feel of the pad can be changed (harder/softer). All Morgan recoil pads will add about 1 1/4 inches to the length of the stock, and include instructions on mounting and adjustments. Morgan recoil pads do not rotate or move sideways.