3M Scotchlok Non-Insulated Butted Seam Ring Tongue terminal ensures an ideal fit while offering reliable and safe performance. The non-insulated, butted-seam barrel has a beveled mouth that guides the wire into position. 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.