3M™ Scotchlok™ Butt Connector has a non-insulated, silver brazed-seam barrel with a beveled mouth that guides the wire into position and withstands crimping pressures or operating stresses. UL Listed, CSA Certified and RoHS 2011/65/EU Compliant. 3M™ Scotchlok™ Butt Connector ensures an ideal fit while offering reliable and safe performance. The non-insulated, brazed-seam barrel with a beveled mouth that guides the wire into position and withstands a maximum temperature of 347 degrees F (175 degrees C). Electrolytic copper construction offers good conductivity and a tin-plated finish resists corrosion.