Prying the Head: Polished smooth no gap, not easy to break. Perfect for your battery changing kit or for use in other applications. Type Case Opener. 1 Watch Case Opener. PROFESSIONAL WATCH REPAIR TOOLS: Great Tools for watch case opening (NOTE: This tool is suitable for watches with pry mouths on the back of the dial, Which can be pried directly, Not suitable for waterproof watches with a back cover that is twist-tightened), Great for opening watch back case and replacing watch batteries.