Grind rail

A grind rail is a railing used by skateboarders, snowboarders, and skiers to do tricks, such as grinds and slides.

[1] They are usually square or round.

The two types of rails are: This article about sports equipment is a stub.

You can help Wikipedia by expanding it.

Grind rail used for skateboarding
Flatbar used with skis
Grind rail used for snowboarding