Nonsparking anodized aluminum plates,Large diameter knobs provide a smooth and easy height adjustment.Long service life,even in corrosive conditions.Rugged construction provides exceptional stability.Ideal for use in chemical labs,biological labs. ● Material: nonsparking anodized aluminum Platforms ● Color:Blue/Silver ● Large diameter knobs provide a smooth and easy height adjustment ● Hand-operated height adjustment wheel is made of phenolic resin ● Ideal for use in chemical labs,biological labs that require stable and precise height regulation