SPEC.            LENGTH OF  NORMAL SHANK    LENGTH OF QUICK CHANGE SHANK

1/8"                 55MM                                         65MM

3/16"               55MM                                          65MM

1/4                   65MM                                         75MM

5/16"                75MM                                         85MM

3/8"                  90MM                                         95MM

1/2"                  90MM                                         95MM