I have several screws that need to be removed from a 2x6 piece of wood that forms the base of my raised stove hearth. I've tried drilling into them to be able to remove the board, but my bits won't cut into the metal and my bit is dulled. What type of bit would penetrate into the screw? I need to remove the boards so I can lay a Pergo-type floor underneath them, trim the boards, re-paint and replace the boards around the hearth.
Greg