Mini Chain Tool Park Tool CT-5Portable Chain Tool Park Tool CT 5 The CT 5 Chain Tool performs like a shop quality tool, in a lightweight compact size that easily fits in a saddle bag or mobile mechanic's tool roll. The CT 5 removes and installs pins on all 5 to 12 speed derailleur chains, including newer SRAM 12 speed designs. The integrated loosening shelf is useful for adjusting tight links on older style chains. CT 5 Features Compatible with all 5 speed to 12 speed bicycle