These optional 3 prong clamps for the RM4 rotary mixer have rubberised prongs to ensure your flasks, bottles or tubes are safely secured.UMC1 Universal Mixer 3 Prong ClampSKU: UMC1ADD TO QUOTE REQUESTFeatures 3-prong clamp to suit standard retort stands Used with RM4 rotary mixer Rubberised fingers for secure clamping Will clamp flasks, bottles and tubes Powder-coated for resistance to spills Specifications Accessories Downloads Applications Other NamesBottle Clamp, Flask Clamp, Tube Clamp