Double Gates, Single Side Gates, Railings and Picket Railings - All in various styles - Flat-top, Curve-top, Double-inverted, Bow-top 1 & 2 and Inverted Arch.
There are also 6 types of Textured Pillars, Walls, and Capstones. They are not all out at the moment, but you get the idea of what is available should you have any custom requirements.
Items can be seen at Fisher Construction in the Plush Alpha Sim.
IM Sid Fisher