AntennaMastsRus - 21" Stainless Antenna is Compatible with Ford F-350 Super Duty (1999-2016) Spring Steel!! Fits: 1999-2016 Ford F-350 Super Duty 21" STAINLESS Tapered High Quality Spring Steel Antenna Easy Screw-On Installation with No Modification, Cutting, or Drilling Ships from Wisconsin!! 100% Satisfaction Guarantee, Period! Ships with Stainless Steel threading for Your Vehicle. Proper threads may not be pictured.