Fotag 100 Pcs Heat Shrink Insulated Assorted Female & Male Bullet Butt Connector Electrical Crimp Wire Terminals 4.0-6.0mm&sup2; 12-10AWG Comply with all relevant European standards 100% Brand new high quality insulated crimp terminals 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.