Park Tool TW 6 Ratcheting Torque Wrench. With today's lightweight components, torque wrench use is no longer an option it's a must for every mechanic. The Park Tool TW 6 is a high quality, ratcheting, click type torque wrench that accurately measures and applies the proper amount of torque to a component's threaded fasteners. It is designed for higher torque settings used for components such as bottom brackets or cassette lockrings. Includes its own protective case for safe keeping in the shop or while traveling. For components requiring lower torque settings, such as seat posts, seat clamps, or handlebarstems, use the Park Tool TW 5 Ratcheting Torque Wrench item PT TW5.