Center hung pivot set consisting of base plate mounted 7255 Bottom Pivot and a head frame mounted 7255 Top Pivot. Maximum Load 500 pounds. Door Thickness minimum 1-3/4". Radius Stop to clear heel edge of door. Pivot Distance 1-3/4" minimum from jamb to centerline of pivot pin. Radius heel edge of door, 1-5/8" minimum recommended. Clearance from bottom edge of door to the floor mounting surface is adjustable from 3/16" to 3/4" by varying the depth of the mortise in the bottom rail of the door. Meets ANSI/BHMA Grade 1. Vertical Adjustment based on mortise preparation in bottom rail of the door.