For professional installation of handles and knobs. It is the highest quality modular cabinet hardware jig on the market. Designed for the installation of a wide range of handles & knobs. Locating holes on door and drawer fronts has never been easier. An invaluable tool for the cabinet installer. Simply slide guides and stop along Metric rulers, tighten thumb screws and drill. It is the core unit of the complete drilling system.Durable lightweight aluminum with case hardened steel bushings.