Doors ranging from 60" tall should use one intermediate pivot. An additional intermediate pivot shuld be sued for each additional 30" in door height. (ie, 90" tall door should use two intermediate pivots)
Mortises into side jamb and hinge edge of door
Handed - Specify LH or RH
For use with  with 3/4" offset pivot sets
Helps maintain door alignment
UL Listed for use on 3-hour fire rated doors - Standard