Double-sided and patented GrooVex sharpening tool. Just unscrew the top, flip the tool, and your shop will never be without the world's first and only conforming groove restoration tool. Easy-to-hold ergonomic hex-designed tool holder, making it easier to repair and restore multiple sets of irons and wedges Trusted by club repair shops, club builders, and golf restoration professionals worldwide. The only groove tool with the maximum conforming groove geometry for width, depth, and groove edge radius.