The 20 Series surface vertical rod exit device is super-heavy-duty panic and fire exit hardware for use on all types of double doors without a mullion. All 20 series SVR exit devices are supplied with top and bottom rod covers and an ADA compliant ramped bottom bolt cover. The patented mounting plate and strike locator system ensures the easiest and most accurate installation of panic hardware available. The 50 Series surface vertical rod exit device is super-heavy-duty panic and fire exit hardware for use on all types of narrow stile double doors without a mullion. All 50 Series SVR exit devices are supplied with top and bottom rod covers and an ADA compliant ramped bottom bolt cover. The patented mounting plate and strike locator system ensures the easiest and most accurate installation of panic hardware available.