Fits Remington M-700 BDL Rifles. 
For more consistant rifle accuracy.  These pillars are ready to use, with no cutting or adjustment necessary.  Adjustable sounds easy, but there is nothing easier than having the right length and the right contour to begin with.  They are also a perfect depth guide when inletting custom stocks.
Are pillars just spacers or a solid foundation?  It depends on how you install them!