HUC46, 4x6 Concealed Flange Hanger, Designed For Schools & Other Structures Requiring Additional Strength, Longevity & Other Safety Factors, Concealed Header Flanges, Can Be Installed Using Round Holes Only, Or Filling Round & Triangle Holes For Maximum Load Values, 14 Gauge Galvanized Steel, Minimum Value Install With Eight 16D Nails Into Header, Four 10D Nails Into Joist, Maximum Value Install With Twelve 16D Nails Into Header, Six 10D Nails Into Joist.