Sure hope someone can help.   My husband has a Dewalt reciprocating saw.   He wants to cut 16ga steel in a circular cut.  He wanted a Dewalt   4815 blade.  This blade is narrow and is only 4" long with a universal shank.    Dewalt no longer makes that blade.  Will any other blade shank fit in this saw?    He sees the type of blade he wants but not with the universal  shank.   Or will he have to go buy another reciprocating saw so he has the type of blade he wants to use?