AMPCO® Nonsparking Double End Box Wrenches feature copper alloy construction for safe use in areas where flammable vapors or combustible residues are present. Choose from 15⁄16 x 3⁄8", 7⁄16 x 1⁄2", 9⁄16 x 5⁄8", 11/13 x 25⁄32", 3⁄4 x 7⁄8", 15⁄16 x 1".