The Park Tool CP-1. 2 Cassette Pliers allow you to grasp 9 to 24 teeth cogs during lockring removal securely. The soft synthetic handle grips boost comfort compared to a traditional chainwhip, and the spring-loaded return makes it easy to use with one hand. It's compatible with 5 to 12-speed cassettes - as well as single-speed cassettes with a 3/32" cog -- and enjoys forged steel construction for longevity in the bike shop or garage. It fits with cogs ranging from 9 to 24 teeth in size to satisfy a full range of cassette sizes.