Mechanical fist

Mechanical fists are variants of Pipe Fists that Mario faces in Super Mario Land 2: 6 Golden Coins. If Mario steps on the wrong trigger panel in the Mario's castle level, a giant fist trap in the resemblance of Wario's glove comes crashing down, pounding the floor with spiked brass knuckles at immense speed (although it is slower on Easy Mode). Mario has to get past three of these traps in total in order to reach Wario and rid him from Mario's castle.

In the Kodansha manga, a mechanical fist is depicted as the literal fist of a giant-sized Wario.

Perfect Ban Mario Character Daijiten
''' ゲンコッツ 　メカ族 　いじわる ゲーム　ランド2 ''' 床のスイッチに気をつけろ  ワリオ城の中で、マリオを待ちかまえる巨大なワリオの手. ゲンコッツの3つ前にある床ブロックがスイッチになっていて、これを 踏むと出現する.

 Mechanical fist  Tribe: Mecha clan Disposition: Impatient Game appearances: Land 2 ' Watch out for the floor switches. ''A giant Wario hand awaits Mario in Wario Castle. The floor block three blocks in front of the mechanical fist is a switch, which you step on to make it appear.''

Trivia

 * If Mario jumps over the center trigger panels in the areas with these enemies, the trap is never triggered and he can walk on by. He must jump over the center trigger panel three consecutive times in order to avoid confrontation with all three of these fists outright.