This part of ISO11900 specifies the dimensions and tolerances, in millimetres, of reduced ball-lock punch retainers, typeC and typeD, for light duty, and of their backing plug, the main use of which is the retention of ball-lock punches in accordance with ISO10071-1, when punching holes in steel sheets.
It also gives material guidelines and specifies the hardness and designation of ball-lock punch retainers that are in accordance with its specifications.