Instructions
Download the "Single Player Commands" for "Minecraft" and unzip the file using an unzip utility, such as Winzip, 7-Zip or WinRAR.
Navigate to the ".minecraft" folder on your computer.
Open the "bin" folder and locate the "minecraft.jar" file.
Right click and open the file with the archive program of your choice (Winzip, 7-Zip or other utility).
Open the "Single Player Commands" folder and copy all the ".class" files into the "minecraft.jar" archive.
Delete the "META-INF" folder within the archive.
Close the archive.
Copy the ".jar" files from the "Single Player Commands" folder into the "bin" folder in your "Minecraft" directory.
Start the game, load your world and press "T" to bring up the chat box. Type "//" without the quotes and press the "Enter" key on your keyboard to be given the "Super Pickaxe." Use the "Super Pickaxe" on bedrock to destroy it.