Advantages of CRL Senior Prima Hinges include the fact that they carry the majority of the weight on the bottom, and have the ability to be inset from the wall, enabling clearance for towel bars and other projections. The Glass-to-Fixed Transom Mount Pivot Hinge is used for doors having fixed transoms above them. When placed vertically, either style can be used in movable transom installations. These Pivot Hinges are self-centering, with four springs for maximum retention strength.