Conductor Wire Range: Accepts copper wires ranging from 8 AWG up to 1/0 AWG. Stud/Bolt Size: Features a single mounting hole designed for a 5/16-inch bolt or stud .Material Compatibility: For copper conductors only (do not use with aluminum).Physical Dimensions: Measures 1-1/2 inches in length, 3/4 inch in width, and 5/8 inch in height .Installation Tool: Features a 1/4-inch hex slot screw for tightening the wire.