The RAS18-6FLX is a heat shrinkable locking fork terminal for wire range #22 - #18 AWG. Locking fork terminals have a specially designed tongue that lets them go on like a fork and stay on like a ring. Upon completed installation, a fully sealed connection protects the joint against the degrading effects of galvanic action, corrosion, and environmental exposure - length 1.35 inches, width .25 inches, bolt hole #6, and maximum insulation .170 inches. The locking fork terminal is made of high-conductivity electrolytic copper, electro-tin plated. They recommended tool ERG4255.