EXTENSIÓN

MEDIDAS:

 1/2 - 1/2
 5/16 - 5/16

 3/8 - 3/8
 3/8 - 5/16

 3/8 - 1/2
 3/8 - 1/4
 5/16 - 1/4

 1/2 - 1/4
 5/16 - 5/32

 5/16 - 3/16

 1/4 - 3/16

 1/4 - 1/4