Daldorado DHH-BO Bone Hand Hold Complete your pool grating system with Daldorado Curb Angles (DCA) and Hand Holds (DHH) for a clean finished line. Daldorado Curb Angles provide the accurate edge required for setting tile or deck finishing while Hand Holds add safety for swimmers by providing the extra grip they need. Curb Angles and Hand Holds are provided pre-drilled, and with fasteners for quick and easy installation