\ QUESTIONS?   COMMENTS? (713) 771-4893      info@zelkobros.com We’re CUSTOM! Serving North America since 1960! Hygiene Area Consoles Built with American Pride and will last a lifetime.  Drawer slides are installed according to their task and load requirements; i.e. 75-100 lb. slides for supply drawers. 150 lb. slides full-extension for file drawers 300-500 lb. for equipment pull-out shelves..