Pedro's has devised the most secure way to manage cogs of any size. The Vise Whip is the world's first locking chain whip. Vice Whip fits cogs from 11T to 23T and makes cassette removal safe and simple; locking jaws won't slip. Heat-treated steel is tough enough for every day use. Compact enough for your toolbox. Please note: Vise Whip is not designed to work with 1/8 in. track cogs.