Park Tool introduced the bicycle world to the 3-way hex wrench set over 40 years ago. Our Y-shaped wrenches fit perfectly in the palm of your hand and provide excellent leverage, making them a favorite of mechanics in bike shops worldwide. The ergonomically-shaped tool body features a glass fiber reinforced polymer center. Each wrench is made from industrial tool steel, through hardened and tempered for long life, with chamfered tips for a perfect fit. The TWS-3 features T10, T25 and T30 Torx-compatible wrenches, three of the most popular star driver fittings found on modern bicycles, including disc rotor bolts (T25), chainring bolts (T30), and hydraulic brake work (T10).