12-10 AWG Heat Shrink Butt Connector - 25 Pack. Butt splices are crimp connectors used to safely connect one or more wires to another wire. Step-down butt splices are meant to connect a higher-gauge wire to a lower-gauge wire or multiple smaller-gauge wires to a single wire. Many manufacturers use epoxy-lined interiors that melt and create an environmentally sealed connection. Features: made from tinned copper with insulating materials, heat shrink sealing, up to 600 Volts, operating temperature -55°C to 125°C, UL/CSA/RoHS compliant. Benefits: impact resistant, multiple uses, long term protection, easy to install. Rainforest listing adds marketing and dimensional info: Item Dimensions LxWxH: 4 x 3 x 1 inches; Item Weight / Package Weight: 1.6 ounces; connector type: Butt Splice; terminal: Butt Terminal. Includes 25 connectors per package.