Stair Block

Stair Block
A stair block is a category of blocks encompassing all stairs in the game. Stair blocks include Stone Brick Stairs, Cobblestone Stairs, Wood Plank Stairs, and Log Stairs

Upside-down Mode
Stairs can be converted into an upside-down stair by pressing 'F' on the stair block. It will then reverse its vertical direction.

Trivia

 * Stairs can be walked up
 * They are obtained from /kit builder in C:BS
 * Pressing 'F' on an upside-down stair will right itself