Finished floor / shower drain strainers with 4″ machined N.P.S.M. threads. Available with a 6″ x 6″ square strainer with a 13 1/4″ square elastomeric flange recessed 1/8″ below the strainer and in either light duty nickel bronze (under 2,000 lbs.) or in heavy duty Type 304 stainless steel (5,000 – 7,499 lbs.). Furnished standard with vandal resistant allen key screws.