Copper Mouth 7 1/2 Shank Correction Bit is a long shank bit. This has a 5" mouth and 7 1/2" cheek. 

Copper Mouth

Correctional Bit 

5" Mouth

7 1/2" Cheek

2" port

4 3/4" Shank

2 1/2" purchase

1 1/4"Rein Ring

1/1/4" headstall ring