100/50PCS Heat Shrink Butt Terminals Waterproof Solder Seal Description: 100% brand new and high quality -An easy one step connection of wires, soldered, insulated and sealed -Can be ideal use in marine and automobile applications -Polyolefin tubing in outside and hot melt adhesive in inside -Solder and seal and with advanced waterproof function -Polyolefin heat shrink butt connectors improved pullout strength, provides seal, strain relief, cable check, and insulation