T-bolt clamps are a great way to keep your boost tubes from ever coming off again! T-bolt clamps are a must have item for any car with a front mounted intercooler, or car that runs of a MAF sensor, where a boost tube popping off can mean a tow! The PERRIN T-bold clamps are powerful enough to crush your boost tubes! Not that we recommend tightening them that much! For those who would like to upgrade from their worm drive clamps to our PERRIN T-bolt clamps, give us a ring, and we can set you up with the sizes you need. The sizes above are sized for the OD of the connection.