NSI Splicer Reducer, Series: SR Series, Aluminum/Copper Conductor, 6 to 4/0 AWG Conductor, 600 VAC, Specifications: 1 Pole, 2 Conductor, 90 deg C, Aluminum, Electro-Tin Plated, 2.31 in L x 0.812 in W x 1 in H Dimensions