Use with solid copper single conductor wire|Used for repairing broken wires and for adding an additional wire to an existing circuit|Create fast splice and tap connections on solid copper wires|Designed for low voltage telecommunication cables|Internal moisture-resistant sealant protects wires from corrosion (indoor/outdoor use)|Quick, easy one-step splicing - insert unstripped conductors, crimp with 33-719 tool|Permanent connection- once crimped they cannot be reused