SAFETY MATTERS: Safety is the top priority during any of your work, certificated products can ensureyou reassured and secure using experience. Position the tubing over the splice. This 245-piece heat shrink butt connectors kit is trusted by automotive technicians, marine electricians, RV owners, boaters, stereo installers, and DIY enthusiasts for its premium tinned copper construction, superior waterproof sealing, easy installation, and excellent value.