Packaging is a little wonky. See photos. For a 3" diameter mouth.
Grandpa Witmer’s Natural Peanut Butter Mixer (model 100) stirs in the separated oils from natural peanut butter without splashing or making an oily mess. Non-hydrogenated peanut butter is considered a healthier choice over those that are hydrogenated. However, dealing with the natural oils that have separated can be a messy nuisance. This innovative must-have of kitchen gadgets solves the issue by easily blending oil back into the peanut butter, right in the original container without splashing.