You will need (1) 4”  Neptune post cap per (1) 4” x 4” post

The wider the assembly

WARNING: Automatic door operation can cause serious injury or death

Superior rust resistance

2-3/8” weave

LiftMaster Std. Duty Adjustable Roller Cage Bearing Hinge - Flat Mount, Both Sides (Prime Coated) Sold in pairs. 3-1/2" x 3-1/2" You will need (1) 4”LiftMaster Std. Duty Adjustable Roller Cage Bearing Hinge Flat Mount, Both Sides (Prime Coated) Serrated Adjustable Yoke Design Provides Fast Easy Adjustability up to . 5 in. Dependable Roller Cage Bearing Design Even Weight Distribution Five Times The Weight Bearing Surface of the Nearest Large Hinge Easy to Fully Lubricate Specifications: Maximum Gate Weight: Up to 1,000 lbs. per pair. Sold in pairs. Pair (2 per Box) 5. 6 lbs. 2. 4 kgs.