Phoenix Contact 1596770 For the M23-PRO series, specific contact configurations include pin or single contact designs with a contact diameter of 1 mm. The permissible crimp range is between 0.08 and 0.22 square millimeters, but note that a contact release tool is not required for certain versions of this series (12- and 17-pos), whereas an alternative product complying with RoHS II regulations with a lead content below 0.1% is available under item number 1240882.