Powrfab Stainless Post Brackets. Existing concrete post channel bracket for 6″x6″ dimensional lumber. The overall dimensions are 8″H x 5-5/8″ inside dimension x 3/16″ x 3″ 316L Stainless Steel flat bar. Bolt hole diameters are 5/8″. There is one 3/4″ diameter hole center of the bottom of bracket. The ECP66-PP (Pro Package) includes: two 1/2″ x 6 1/2″ 316 stainless bolts, one 1/2″ x 5 1/2″ 316 stainless wedge anchor, nuts and washers. Manufactured with marine grade (316L) stainless, these structural connectors are the most corrosion resistant available for the construction industry today. PowrFab Brackets were originally designed for the corrosive atmosphere of the Pacific Northwest coast, these heavy gauge 316L stainless brackets are virtually impervious to salt, sand and ocean spray. PowrFab® Solid Stainless Steel Brackets have set the new standard of excellence for quality construction. Don’t sacrifice the structural integrity of your building. So, whether it is new construction, a remodel or replacement of those rusted galvanized brackets, choose the best in the industry.