Copper One-Hole Compression Lug, Standard Barrel, 2/0 AWG Copper Conductor, 3/8 inch Bolt Size, Tin-Plated High-Conductivity Copper Construction, with Inspection (Peep) Hole, Die Code 45, Black Color Code, rated up to 35 kV. Designed for permanent low-resistance compression connections in power distribution, grounding, industrial electrical, and commercial applications.