Crowbar

A crowbar is a type of tool often used to pry open things.

When Batman was on top of Mystery Mountain trying to open the trapdoors that led to the inside of Shamon's laboratory, he realized that what he needed was a crowbar to open it up, but since none were on hand, he got a tree branch and decided to use it, but he ultimately changed his mind when he saw that a laser beam was being blasted through the doors.