Professional's Choice Rasp Shank Correction Bit.   6" rasp detailed cheek with a 5 1/4" mouth and 2" port.  This bit is designed with 4 moving parts which allow the horse to respond to light rein pressure which diminishes heavy rein handling.  Copper bars creates a moist mouth.

Rasp shank correction bit

6" cheek

5 1/4" mouth

2" port