Use this blue connector without cutting to electrically join a tap in the middle of a length of wire while adding insulation Easily shows the appropriate wire size via its color Wiring for vehicles such as cars, boats and RVs can use this connectors, as well as wiring for control circuits, fixtures, appliances and signal and PA systems Sized to work with solid or stranded wire in sizes 18 to 16 AWG and with stranded wire in size 14 AWG The element is constructed of brass to conduct electricity well and plated in tin to prevent corrosion Works well in temperatures upto 167 degrees F (75 degrees C) For industrial/occupational use only. Not for consumer sale or use