Pivots reduce stress on the frame by distributing the door weight throughout the floor and structure. By taking advantage of the structure strength, this makes a pivot the ideal solution for heavy doors. Center and pocket pivots also provide an aesthetic option for an opening. Ives offers a complete line of pivots with all exposed parts made of brass or stainless steel for maximum corrosion resistance, combined with precision bearings for smooth operation. The positive locking vertical adjustment mechanism allows the installer to precisely position the door and balance the load. Use intermediate pivots for door heights over 7'0" and one every 2'6" as needed. Also for door weight over the pivot set limit; use one additional pivot for every additional 100 pounds. Recommended for use with 1-3/4" minimum door thickness, with 1/8" bevel in 2". UL Listed, 20 minute fire doors.