You will find here the extremely popular "Magic-clamp" series that can be used with any Benchmark Scientific orbital shaker that has been equipped with a magnetic platform.
You must have a Benchmark magnetic platform to properly use any of these clamps. Orbital shakers or shaking incubators from competitor brands manufacture their platforms from either aluminum, stainless steel or a fiberglass composite, none of which can accommodate a magnet.
Also be sure to check out the new One Clamp™ adjustable magnetic clamp that fits 125ml, 250ml and 500ml Erlenmeyer flasks (glass or plastic/polycarbonate).