LOK-KNOBS, 5/16” thread set (1 positive, 1 negative), tri-handle 12V battery knobs, replaces the wing or hex nuts on any 12V battery with stud posts. With a corrosion-resistant stainless steel threaded insert, these knobs attach securely by hand tightening only. The knob colors and clearly visible symbols for both positive (+) and negative (–) provide added security from terminal attachment mix-ups. LOK-KNOBS Safety Terminal Covers will shield exposed metal which carries voltage. These Safety Terminal Covers ensure all metal on terminals are covered and protected. They are an essential addition to your electrical setup. Enhance safety and prevent accidents with these high-quality, durable knobs and terminal covers. The safe and secure way to connect terminals to your battery. No tools ever needed. Battery not included.