Track wire sizes on your jobs with a 3M™ Scotchlok™ 557 IDC Pigtail Electrical Connector. The polypropylene-insulated device is colored red to indicate the size it will accommodate, and its element is made of brass coated with tin to provide good conductivity while resisting corrosion when creating dual-element connections. This connector is UL Listed, CSA Certified and RoHS 2011/65/EU Compliant so you know you'll get great results.