Horstman presents its HDC-5C with triple discs for harder lock up, increased torque capacity and improved heat transfer. 2.5 size discs with cerametalic formula for consitency and low inertia. Model HDC-5C designed for Yamaha KT-100 pipe classes. billet components for greater precision and rigidity. Please specify driver size: 10, 11, 12 or 15 tooth driver