Top Grip Nuts allow for easy installation into Powerstrut channel. Once inserted into the channel and with a 90 turn, these spring nuts will stay in place allowing hands-free installation of other components. The 1/2" size in an EG finish are OPM and LARR pre-approved for seismic bracing. Seismic load capacities have been tested in accordance with seismic standards. This series is available in Electrogalvanized (EG) and Stainless Steel (SS).