Armstrong Titanium Foil Screw T-Set Performance Mast - 30mmTitanium Performance Set of 4 Titanium T Nuts with Torx head Ti screws, with countersunk heads. Attention to design and detail is what sets Armstrong apart! Armstrong uses the very best materials for each respective job, this is why we use Titanium for their hardware and fittings. Ultimate strength and no corrosion means your mast to board connection is dependable. * We recommend changing out your screws annually as repeated use will eventually reduce