Chemical Resistant Steel Lab Stand, Support Stand with Cast Iron Rings, 3" and 4" Ring Size, 6" Base Length x 4" Base Width (SET462)Zinc Plated Steel Rod (18") ample clearance for experiments and assessments Black Support Stand (6" X 4") fits easily on a lab bench or countertop Two cast iron rings, with diameters of 3" and 4" Suitable for holding various types of lab equipment, such as beakers, flasks, or test tubes Rings are easily adjustable and can be positioned at various points along the rod to meet your specific needs The casting process gives the rings a smooth and chip