Material : Spring steel HRc = 46 to 51 or HV = 470 to 540 Kg/mm2
The grip rings are manufactured as illustrated on the right hand side
of the sketch except those
marked with an asterisk. The rings marked with an asterisk * are made as shown on the left hand
side of the sketch. When new punching tools have been manufactured conversion to the design
without holes will be made.
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