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Improved Base Design Save money with our new line of laboratory support rings and stands. Rock solid support for laboratory, school or shop use, these stands are cast iron with rubber wear guards to protect your laboratory counter tops from scratching. The support poles are 1/2" diameter. Available in 3 sizes. Support Rings feature improved style clamping knob that will not transfer heat and makes for safer adjustments when in use in boiling or heating applications. Available in 4 sizes.