Park Tool CTP Replacement Chain Tool Pins (Pack of 2) A must have for any professional or home cycle workshop. These replacement pins are made from hardened alloy and use 7mm or 9/32†12 pt box end/socket. The CTP pins are suitable for the following Park Tool Chain tools. CT-1 CT-2 CT-3 CT-3.2 CT-5 CT-7 Come in pack of 2. Covered by Park's legendary limited lifetime warranty. Made in the USA. Description by Val, SDJ Sports.