Impact driven Heavy-Duty expander allows for fitting smaller exhaust piping and making exhaust seals; The 28mm drive tool and collet sets expand pipes from 1-5/8″ to 4-1/4″; Includes: Steel expander 1 5/8″ – 2″ Collet; Steel expander 2″ – 2 1/2″ Collet; 2 3/8″- 2 3/4″ Collet; 2 3/4″ – 3 1/8″ Collet; 3 1/8″ – 3 1/2″ Collet; 3 1/2″ – 3 7/8″ Collet; 3 7/8″ – 4 1/4″ Collet