Martin MAC Viper AirFX, omega brackets have been upgraded to steel without a captured nut. Dual case included when purchased in quantities of 2. Units do not come with clamps, safeties, nor power cords. Typical prep time is 3 - 4 weeks after payment processing. Due to seasonal volume, orders placed between March and May are likely to have longer lead times than usual. If you have a quick turnaround requirement please inquire prior to placing an order.