SPINFIN* Magnetic Stirring Bar Ideal for stirring fluids in round-bottom test tubes and flasks where standard stirring bars are ineffective. Keeps its position in a vessel. Wobble-free agitation. Teflon* PTFE coated. ALNICO V encapsulated magnet. Diameter x Height: 16 x 12.7mm (5/8 x 1/2in).
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