Aluminum Splice Reducer is AL9CU Dual Rated for both Copper and Aluminum Conductors. Manufactured from High Strength 6061-T6 Aluminum Alloy to ensure both Maximum Strength and Conductivity. Electro Tin Plated to provide low contact resistance and protection against corrosion. 90612~90614 use slotted screws. 2 Screw Aluminum Reducer is rated 600 Volts. UL486B/CSA Listed. Rated for use with Cables up to 194°F(90°C)