The Hennessy Ammco 4100B Combination Disc and Drum Brake Lathe is designed for wider brake assemblies. The 4100B offers the same basic design and features of the company's Ammco 4000B, but adds an additional spindle travel of 9.875". This unit is designed to be easy-to-use, fast and precise. The speed control technicians to fit in more customers each day without loss of quality finish.