Insulation Piercing Mechanical Connector For Use With Aluminum Or Copper Cables, Aluminum or Copper Conductor Size Tap No. 4 AWG - 250 kcmil, Does not require cable insulation to be stripped, Flexible design - can be used as a tap, splice or dead end connector, For use with outdoor and indoor installation, Glass filled nylon body provides long term durability, Hardened copper teeth provide proper penetration of cable insulation for a reliable electrical connection, UL Listed and CSA Certified for use up to 600 V and temperature rated 90 degrees celsius.