Features a thermoplastic body and threaded stud. Maximize the power of your single or double battery to auxiliary applications Exceeds SAE and FMVSS specifications Options: SST2A: 1″L x 5/16″-dia. SST2B: 1-1/2″L x 3/8″-dia SST2B-R: Red 1-1/2″L x 3/8″-dia SST2C: 1″L x 1/2″-dia