Adjustable stainless steel centralizers hold screen and casing in place to eliminate off-center placement during installation. Constructed from stainless steel, centralizers resist corrosion and will not contaminate the well. Stainless steel worm gears tighten easily for quick attachment to the screen and casing. Call for quantity discounts on 10 or more pieces. 100% Made in the USA. Conforms to the 'Buy American Act'.