3M Scotchlok Vinyl Insulated Brazed Seam Ring Tongue ensures an ideal fit while offering reliable and safe performance. The terminal has a vinyl-insulated, brazed-seam barrel and withstands temperatures of -40 to 221 degrees F (-40 to 105 degrees C). Electrolytic copper construction offers good conductivity and a tin-plated finish resists corrosion.A ring is the standard style of tongue. The safest and most reliable; it cannot be removed unless mounting screw is removed.