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Pediments and keystones are two of the fastest ways to give a plain window or entry door real presence. A peaked or arched pediment sets the frame; a keystone anchors it. Both are lightweight, factory-primed HDP urethane, so they install with basic tools and no special equipment — but a little planning up front makes the difference between a crisp, symmetrical installation and one that looks slightly off from the street.Before You Start- Confirm that the width of your pediment or crosshead …