Benchmark's new innovative adjustable MAGic Clamp for use with the Benchmark Incushakers and Orbital Shakers that are equipped with the MAGic Clamp Magnetic Platform. One adjustable clamp for 3 different size flasks. 125 ml, 250ml, and 500ml flasks fit in the new MAGic Clamp. Just rotate the lever to choose the desired position! Magnetically attaches to any Benchmark shaker or incubator-shaker that has the MAGic Clamp platform. If you have any questions please give us a call (800)355-2956.