ProX XT-GRTOP24 BLK 24" Width Module Top Bar for ProX XT-GRU Rapid Grid Modular System (Black Finish)ProX XT GRTOP24 BLK 24" W Top for Hanging Grids. The XT GRU3024 Rapid Grid modular design allows endless configurations for single fixtures, double hanging or ladders of multiple fixtures, which can also be expanded to create a wall of hanging positions. Each U module has two safety point attachments, one on each side for use with multiple styles of fixtures. The ProX GRU Rapid Grid System has been designed for quick deployment and take down in any