RT4-8K - 8pcs 4awg 3/8” and 4awg 5/16” Copper Ring Terminals, Cable Lugs, Wire Lugs, Heavy Duty Battery Lugs, with 8pcs Heat Shrink Tubing

The RT4-8K is a copper ring terminal kit designed for 4AWG wiring in car audio installations and other 12V power applications. Each terminal delivers a secure, low-resistance connection at the battery, distribution block, or ground point. The included heat shrink tubing seals each connection against moisture and corrosion for long-term reliability.

• 99.9% pure copper construction — maximizes conductivity and resists corrosion over time.
• Dual bolt hole sizes included — 4 terminals with 3/8" ring and 4 terminals with 5/16" ring to fit common stud sizes.
• 8pcs dual-wall adhesive heat shrink tubing — 4 red and 4 black for polarity identification and a watertight seal.
• Rated for 4AWG wire — compatible with standard 4-gauge power and ground cable used in car audio builds.
• Kit quantity: 8 terminals + 8 heat shrink pieces — enough for a complete power run or multiple connections in one package.