3M Scotchlok Electrical Insulation Displacement Connector, 557, black, pigtail, 22-16 AWG 3M Scotchlok Electrical Insulation Displacement Connector electrically connects a (tap) wire end to a through (run) wire, and insulates the connectionIt has a maximum insulation O.Ddiameter of 0.120 inches (3.05 mm) and an operating temperature of 221 degrees Fahrenheit (105 degrees Celsius)The suggested application tool for this connector is the 3M Scotchlok Crimping Tool, E-9BM. Product Information Brand 3M Part # 7000058271 Line Scotchlok Origin Country USA Product Type Connectors Product InformationConnects and insulates in one stepDesigned for use with the 3M Scotchlok Crimping Tool, E-9BMFlame retardantMoisture resistantSelf-strippingSuggested ApplicationElectrically connects a (tap) wire end to a through (run) wire and insulates the connectionDesigned for control circuit wiring, fixture wiring, appliance wiring, signal and PA systems, automotive/boat/RV wiringIdeal for run and tap splicing applications