Morris Products 96020 Parallel Groove Clamp, 1 Bolt, Aluminum, 1/0 - 4/0 CU-AL Main, .373 - .563" Wire Diameter Main; 8-1/0 CU-AL Tap, .128-.398" Aluminum Parallel Groove Clamps 1 Bolt - This One Bolt Parallel Groove Clamp is thermically treated for durability Our parallel groove clamp is manufactured of extruded aluminum alloy thermically treated, this clamp offers high electrical conductibility, high strength and corrosion resistance The set screw, lock washer and nut are hot dip galvanized Use for Heavy Duty Service Entrance or Distribution Armored Rod Clamps All sizes of groove clamps are packed in plastic bags and filled with antioxidant compound