Parametric 3/4"Ø A325 Heavy Hex Bolt. Grip is an instance paramter. Based on grip, formulas determine bolt length and weight (shared parameters) which allow for scheduling and more importantly, bolt list with bolt lengths. Parametric void to cut hosted framing. Bolt visibility paramters are also in place plus an instance parameter for a welded nut (moves the washer to the bolt head side of grip) Based on Portland Bolt specs. Revit 2012.