Bolt Lift

Bolt Lifts, also known as bolts or Nuts, are a set of nuts (often four of them) that are screwed onto a very long bolt that serve as platforms in several Mario platformer games.

Super Mario Bros. 3 / Super Mario Advance 4: Super Mario Bros. 3
They serve as platforms in Super Mario Bros. 3. They only appear on airships, and are usually only horizontal. Like Donut Blocks, Mario and Luigi must continually jump to avoid falling. However, with each jump, the Bolt Lift moves to the right slightly, so they can be used as a transport above bottomless pits or dangerous Burners. Bumping a Bolt Lift from below moves it to the left.

Super Mario Galaxy
Bolt Lifts later make an appearance in Super Mario Galaxy, and are located in Dreadnought Galaxy. Here, they are operated by standing on the left side, so that they twist like a screw and move forward on the screw that they are on. The player has to stay in motion to avoid falling.

New Super Mario Bros. Wii
Bolt Lifts reappear in New Super Mario Bros. Wii, behaving the same as in Super Mario Bros. 3. Only two appear in the entire game, specifically in in the secret area with the level's second Star Coin.

Super Mario 3D Land
Bolt Lifts also appear in Super Mario 3D Land, behaving as they did in Super Mario Galaxy. Only two appear in the entire game, one in World 8-6 and the other in Special 8-4.

New Super Mario Bros. U / New Super Luigi U / New Super Mario Bros. U Deluxe
Bolt Lifts return in New Super Mario Bros. U and New Super Luigi U, and act the same as in the previous games. They appear in the level The Mighty Cannonship in the former and in the level All Aboard! in the latter.

Super Mario RPG: Legend of the Seven Stars
Bolt Lifts also appear in Super Mario RPG: Legend of the Seven Stars. Here, they are found in the Factory, and work very much like isometric versions of their Super Mario Bros. 3 counterparts. Also, falling off of them usually results in being thrown back to the beginning of them (usually in a humorous way involving trampolines) rather than death.