As described in an earlier blog, 5/8" Diameter Askew Head Bolt published on July 20, 2013, in new construction embedded Wedge Inserts will require 3/4" diameter Askew Head Bolts. The only time a project requires 5/8" diameter Askew Head Bolts is during a renovation where the Wedge Inserts are pre-existing. Usually this would be a structure constructed prior to approximately 1970.