The Spinbar Restrainer captures magnetic stirring bars in containers. When placed alongside the outer wall of a mixing vessel, it readily attracts and holds the stirring bar in place. As vessel is drained, the stirring bar is securely retrieved from vacant vessel. The Spinbar Restrainer is molded of easy to clean high impact polystyrene. It contains a powerful magnet that attracts and holds magnetic stirring bars up to 80mm (3") long.