Each is 5.5 inches in length (14 cm). Effective tools for precious metals testing. See if the gold and silver you're buying are solid or clad, layered. Use on bullion bars, ingots, coins, tokens, encased pieces, world coins, antiques, vintage heirlooms, estate gold, auction pieces, and more. This variety pack includes 1 each of the following shapes: knife, square, round, half-round, half-round double edge, triangular, triangular one edge, flat, oval, & flat-pointed.