The RCBS Standard Scale Check Weights are a great set of weights to determine if a reloading scale is reading correctly. Over time grit and dust can accumulate on measuring equipment which can effect the accuracy. By using check weights reloaders get the piece of mind knowing that their equipment is measuring accurately. Contains the follow weights: 2-20 Grain1-10 Grain1-5 Grain2-2 Grain1-1 Grain1-1/2 Grain