NEF Heat Shrink Crimp and Solder Butt Connector Assortment, 22-18, 16-14 and 12-10 Gauge, Plastic Organizer, 55 Piece Kit 22-18 AWG Red Heat Shrink Solder Electrical Butt Connectors (Qty 20) 16-14 AWG Blue Heat Shrink Solder Electrical Butt Connectors (Qty 20) 12-10 AWG Yellow Heat Shrink Solder Electrical Butt Connectors (Qty 15) Adhesive-lined polyolefin tubing allows visual inspection Conforms to automotive manufacturers' specifications for wiring repairs