Crank Design - Features three curved surfaces to maximize the stirring area inside the jar. Supports a minimum jar opening size of 2 inches and a maximum jar height of 6.3 inches. Anti-Spill Lid - Fits three different jar opening sizes: 1.26oz - Outer diameter 3.23 inches, Inner diameter 2.87 inches 2.16oz - Outer diameter 3 inches, Inner diameter 2.64 inches 3.16oz - Outer diameter 2.44 inches, Inner diameter 2.12 inches Please measure your peanut butter jar before purchasing. Spreader Knife - The scraper with a cleaning hole design easily returns excess peanut butter on the stirring stick to the jar and can be used for daily spreading and scooping. Dishwasher Safe - Made of stainless steel 304 and silicone material, BPA-free. Patent Pending.