There is no standard size for a fishing lead. The actual size of the lead depends on a few other things like the material and weight of it. The type of lead also determines the size. For this reason, you will find that they come in a wide range of sizes. A much more useful way of classifying leads is based on its weight. A tackle that people use for regular casting weights is around 150 grams. For multi-hook fishing, the weight should be more than that. In those cases, you will need to increase the number of weights to weight between two hundred and three hundred grams.