Lucksender 100Pcs Blue 16-14AWG/1.5-2.5mm Heat Shrink Butt Wire Crimp Connector Electrical Terminals Guaranteed to hold the strong crimps. Standard crimp and then seal heat shrink butt connectors. Allows visual inspection, prevents corrosion, and provided a waterproof seal. For best results use a hot air gun until it reduces in size and the adhesive flows, filling gaps within the terminal. Blue connector : Suits cable/ wire sizes 1.5-2.5mm2 16-14 AWG