 The shells are attached to the backer by hex screws with crushable washers, so the shell can be adjusted up or down at the owner's discretion.The company also includes multiple sizes of washer for the user to customize their own holster should that be desired.Inside the waistband holsters made by Alien Gear have adjustable belt clips, which allow the user to set the height the holster rides at inside the waistband, as well as the angle the pistol sits at by moving the belt clip between the weld nut position on the wings of the holster.