Well points are made of a variety of types and sizes.  The welded continuous slot 

screen is made as a well point by attached a forged-steel point to the lower end of a 

screen and a threaded pipe shank to the upper end.  This type of construction is the 

most efficient hydraulically.  The most common sizes are 1 ¼ inch or 2 inch.  They 

are constructed of either  low-carbon steel or stainless steel.  Although they can 

withstand hard driving, they  should not be twisted while  being driven or used in 

areas where boulders or large stones are expected.         info7356@guangxing-screens.com